SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                              --------------------

                                    FORM 8-K


                                 CURRENT REPORT

     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934



         Date of Report (Date of earliest event reported):  September 10, 1997
                      ------------------------------------


                          CITIBANK (SOUTH DAKOTA), N.A.
                                  ON BEHALF OF
                        STANDARD  CREDIT CARD TRUST 1990-6 
           (Issuer in respect of the Standard Credit Card Trust 1990-6
              9-5/8% Class B Credit Card Participation Certificates)


               (Exact name of registrant as specified in charter)



       UNITED  STATES  OF  AMERICA                          33-35500 
    (State or other jurisdiction of                   (Commission File No.)
            incorporation)

                                   46-0358360
                      (I.R.S. Employer Identification No.)

       701 EAST 60TH STREET, NORTH
        SIOUX FALLS, SOUTH DAKOTA                             57117
  (Address of principal executive offices)                  (Zip Code)


        Registrant's telephone number, including area code (605) 331-2626


                                 NOT APPLICABLE
         (Former name or former address, if changed since last report.)





                                       1
<PAGE>
ITEM 5.  OTHER EVENTS.

         Set forth  below is a copy of the    Class    B    Certificateholder's
Statement relating to the Distribution Date occurring on September 10, 1997
and the related Due Period delivered pursuant to Section 5.02 of the Pooling and
Servicing Agreement dated as of June 28, 1990 (the "Pooling Agreement") relating
to Standard  Credit Card Trust 1990-6 among Citibank  (South  Dakota),  N.A., as
Seller and Servicer, Citibank (Nevada), National Association, as Seller, and The
Chase  Manhattan  Bank  (formerly  known as  Chemical  Bank),  as  Trustee.  The
Certificateholder's  Statement contains information relating to the distribution
to Certificateholders on the referenced Distribution Date as well as information
relating to the  Receivables  and the Accounts from which the  Receivables  have
arisen.  Capitalized  terms used but not defined  herein have the  meanings  set
forth in the Pooling Agreement.





                                       2
<PAGE>

                      CLASS B CERTIFICATEHOLDER'S STATEMENT

                          CITIBANK (SOUTH DAKOTA), N.A.
                     CITIBANK (NEVADA), NATIONAL ASSOCIATION

--------------------------------------------------------------------------------
                        STANDARD CREDIT CARD TRUST 1990-6
--------------------------------------------------------------------------------

          Under the Pooling and Servicing  Agreement (the "Pooling and Servicing
  Agreement")  dated as of June 28, 1990, by and among Citibank  (South Dakota),
  N.A., as Seller and Servicer,  Citibank  (Nevada),  National  Association,  as
  Seller and  Chemical  Bank as  Trustee,  the  Servicer  is required to prepare
  certain  information  each month regarding  current  distributions  to Class B
  Certificateholders  and the performance of the Standard Credit Card Trust 90-6
  (the "Trust") during the previous month. The information  which is required to
  be prepared  with respect to the  distribution  on September  10, 1997 Payment
  Date (the  "Payment  Date") and with respect to the  performance  of the Trust
  during the Due Period(s) with respect to such Payment Date is set forth below.
  Certain of the information is presented on the basis of an original  principal
  amount  of  $1000  per  Class B  Certificate.  Certain  other  information  is
  presented on the aggregate  amounts for the Trust as a whole.  All capitalized
  terms used herein shall have the respective  meanings set forth in the Pooling
  and Servicing Agreement.

  A.    Information Regarding Distributions to Class B
        Certificateholders (Stated on the Basis of $1,000
        Current Invested Amount).

    1.  The total amount of the distribution to Class B
        Certificateholders on the Payment Date, per $1,000
        interest...........................................$        1,016.042

    2.  The amount of the distribution set forth in paragraph
        1 above in respect of principal on the Class B Certi-
        ficates, per $1,000 interest.......................$        1,000.000

    3.  The amount of the distribution set forth in paragraph
        1 above in respect of interest on the Class B Certi-
        ficates, per $1,000 interest.......................$           16.042

  B.    Information Regarding the Performance of the Trust

    1.  Collections of Receivables.

        (a)  The aggregate amount of Collections of Receivables
             processed during the Due Period(s) with respect
             to the Payment Date...........................$   1,606,238,708

        (b)  The aggregate amount of Collections of Receivables
             in respect of Finance Charge Receivables processed
             during the Due Period(s) with respect to the
             Payment Date..................................$     170,980,866 [1]




                                       3
<PAGE>
        (c)  The aggregate amount of Collections of Receivables
             in respect of Principal Receivables processed during
             the Due Period(s) with respect to the Payment
             Date..........................................$   1,435,257,842 [2]

    2.  Allocation of Receivables.

         (a)  The Class B Floating Allocation Percentage for
              the Due Period(s) with respect to the Payment
              Date..........................................

              First Due Period......  8.45
              Second Due Period.....  8.56
              Third Due Period......  8.64
              Fourth Due Period.....  8.67
              Fifth Due Period......  8.71
              Sxth Due Period.......  8.73

         (b)  The Fixed Allocation Percentage...............    8.2516%      [3]

    ------------------------------------------------------------

    [1] Includes Interchange and Recoveries.

    [2] During  the  Revolving  Period,  this  amount  (or the  portion  thereof
        received prior to the occurrence of an Amortization  Event) will be paid
        solely to the  holders  of the  Seller  Certificate  or,  under  certain
        circumstances, will be used to fund certain payments with respect to the
        Class A Certificates.

    [3] Applicable  during the  Accumulation  Period and any Early  Amortization
        Period.


                                       4
<PAGE>
    3.  Available L/C Amount.

        (a)  The amount  available to be drawn under the
             L/C (the "Available L/C Amount") as of the 
             close of business  on the  Payment  Date,
             after giving  effect to any  drawings on the
             L/C and  payments to the L/C Issuer on such
             Payment Date..................................$     84,300,000

        (b)  The ratio of the  Available  L/C  Amount  to
             the  Class B  Invested Amount as of the
             close of business on the Payment Date 
             after giving effect to any drawings
             on the L/C and payments to the L/C Issuer
             on such Payment Date..........................               N/A

    4.  Delinquent Balances.

        (a)  The  aggregate  outstanding  balance  of the
             Accounts  which  were delinquent by 35 days
             to 64 days as of the close of business on 
             the last day of the calendar month preceding
             the Payment Date..............................$     32,776,292

        (b)  The  aggregate  outstanding  balance  of the  
             Accounts  which  were delinquent  by 65 days
             or more as of the close of  business  on the
             last day of the calendar month preceding
             the Payment Date..............................$     51,279,407

    5. Class B Investor Default Amount.

        The Class B Investor Default Amount for the
        Distribution Date(s) with respect to the Payment
        Date...............................................$        730,068

    6. Class B Investor Charge-Offs; Reimbursement of Charge-Offs.

        (a)  The aggregate of the Class B Investor Charge-
             Offs and other reductions in the Class B
             Invested Amount (other than due to the payment
             of principal to the Class B Certificateholders),
             if any, for the Distribution Date(s) with respect
             to the Payment Date...........................$              0

        (b)  The  amount  of  the  Class  B  Investor  Charge-  
             Offs  and  other reductions  in the Class B 
             Invested  Amount set forth in Item 6(a)
             above, per $1,000 interest (which will
             have the effect of reducing, pro rata, 
             the amount of each Class B Certificate-
             holder's investment)..........................$              0

        (c)  The total  amount  reimbursed  to the  Trust
             for such  Distribution Date(s) in respect of
             Class B Investor Charge-Offs and other
             reductions in Class B Invested Amount.........$              0




                                       5
<PAGE>
        (d)  The amount set forth in Item 6(c) above,
             per $1,000 interest, which will have the
             effect of  reinstating,  pro rata, the amount
             of each Class B Certificateholder's
             investment....................................$              0

        (e)  The amount,  if any, by which the out-
             standing  principal balance of the
             Class B  Investor  Certificates  exceeds
             the Class B  Invested Amount as of the
             end of the day on such Payment Date...........$              0

    7.  Servicing Fee.

        The  aggregate  amount  of the  Class B  Monthly 
        Servicing  Fee paid or payable by the Trust 
        to the Servicer for the Distribution Date(s)
        with respect to the Payment Date...................$       1,831,113

    8.  The existing Deficit Controlled Amortization
        Amount for such Payment Date.......................$              0


  C.    The Class B Pool Factor.

        The Class B Pool Factor for the preceding
        Record Date (which  represents the  ratio  of
        the  Class  B  Invested  Amount  as of such  Record 
        Date (adjusted  after taking into  account any  
        increases or decreases in the Class B Invested 
        Amount which will occur on the following  
        Distribution Date)  to  the  Class  B  Initial  Invested 
        Amount.)  The  Amount  of a Certificateholder's  pro 
        rata  share  of  the  Invested  Amount  can be determined
        by multiplying the original denomination of the
        holder's Class B Certificate by the Pool Factor.....            0.00%

  D.    Receivables Balances.

    1.  The aggregate amount of Principal Receivables
        in the Trust at the close of business on the
        last day of the preceding Due Period...............$  1,779,757,372

    2.  The aggregate  amount of Finance Charge 
        Receivables in the Trust at the close of
        business on the last day of the preceding
        Due Period.........................................$     26,321,698
     

                                                  CITIBANK, SOUTH DAKOTA
                                                  as Servicer



                                                  By: /s/ Joseph Mecca
                                                       ------------------
                                                       Name: Joseph Mecca
                                                       Title:Servicing Officer




                                       6
<PAGE>
                                          SIGNATURES

                 Pursuant to the requirements of the Securities  Exchange Act of
1934,  the  registrant has duly caused this report to be signed on its behalf by
the undersigned hereunto duly authorized.


                                          CITIBANK (SOUTH DAKOTA), N.A.,
                                          as Servicer
                                          Standard Credit Card Trust 1990-6



                                          By:  /s/ Eugene D. Rowenhorst
                                               --------------------------------
                                               Eugene D. Rowenhorst
                                               Senior Vice President

Dated: September 16, 1997



                                       7
<PAGE>
[{"type": "8-K", "sequence": "1", "description": "STANDARD CREDIT CARD TRUST 1990-6, MONTHLY REPORT", "secsgml_size_bytes": 13092}]
{"company-data": {"conformed-name": "CITIBANK SOUTH DAKOTA N A", "cik": "0000839947", "assigned-sic": "6189", "irs-number": "460358360", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-17797", "film-number": "97688340"}, "business-address": {"street1": "701 E 60TH ST N", "city": "SIOUX FALLS", "state": "SD", "zip": "57117", "phone": "6053312626"}, "mail-address": {"street1": "CITIBANK N A LEGAL AFFAIRS OFFICE", "street2": "425 PARK AVENUE 2ND FLOOR", "city": "NEW YORK", "state": "NY", "zip": "10043"}}
SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                              --------------------

                                    FORM 8-K

                                 CURRENT REPORT

     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

         Date of Report (Date of earliest event reported):  September 10, 1997
                      ------------------------------------

                          CITIBANK (SOUTH DAKOTA), N.A.
                                  ON BEHALF OF
                        STANDARD  CREDIT CARD TRUST 1990-6 
           (Issuer in respect of the Standard Credit Card Trust 1990-6
              9-5/8% Class B Credit Card Participation Certificates)

               (Exact name of registrant as specified in charter)

       UNITED  STATES  OF  AMERICA                          33-35500 
    (State or other jurisdiction of                   (Commission File No.)
            incorporation)

                                   46-0358360
                      (I.R.S. Employer Identification No.)

       701 EAST 60TH STREET, NORTH
        SIOUX FALLS, SOUTH DAKOTA                             57117
  (Address of principal executive offices)                  (Zip Code)

        Registrant's telephone number, including area code (605) 331-2626

                                 NOT APPLICABLE
         (Former name or former address, if changed since last report.)

                                       1
ITEM 5.  OTHER EVENTS.

         Set forth  below is a copy of the    Class    B    Certificateholder's
Statement relating to the Distribution Date occurring on September 10, 1997
and the related Due Period delivered pursuant to Section 5.02 of the Pooling and
Servicing Agreement dated as of June 28, 1990 (the "Pooling Agreement") relating
to Standard  Credit Card Trust 1990-6 among Citibank  (South  Dakota),  N.A., as
Seller and Servicer, Citibank (Nevada), National Association, as Seller, and The
Chase  Manhattan  Bank  (formerly  known as  Chemical  Bank),  as  Trustee.  The
Certificateholder's  Statement contains information relating to the distribution
to Certificateholders on the referenced Distribution Date as well as information
relating to the  Receivables  and the Accounts from which the  Receivables  have
arisen.  Capitalized  terms used but not defined  herein have the  meanings  set
forth in the Pooling Agreement.

                                       2
CLASS B CERTIFICATEHOLDER'S STATEMENT

                          CITIBANK (SOUTH DAKOTA), N.A.
                     CITIBANK (NEVADA), NATIONAL ASSOCIATION

--------------------------------------------------------------------------------
                        STANDARD CREDIT CARD TRUST 1990-6
--------------------------------------------------------------------------------

          Under the Pooling and Servicing  Agreement (the "Pooling and Servicing
  Agreement")  dated as of June 28, 1990, by and among Citibank  (South Dakota),
  N.A., as Seller and Servicer,  Citibank  (Nevada),  National  Association,  as
  Seller and  Chemical  Bank as  Trustee,  the  Servicer  is required to prepare
  certain  information  each month regarding  current  distributions  to Class B
  Certificateholders  and the performance of the Standard Credit Card Trust 90-6
  (the "Trust") during the previous month. The information  which is required to
  be prepared  with respect to the  distribution  on September  10, 1997 Payment
  Date (the  "Payment  Date") and with respect to the  performance  of the Trust
  during the Due Period(s) with respect to such Payment Date is set forth below.
  Certain of the information is presented on the basis of an original  principal
  amount  of  $1000  per  Class B  Certificate.  Certain  other  information  is
  presented on the aggregate  amounts for the Trust as a whole.  All capitalized
  terms used herein shall have the respective  meanings set forth in the Pooling
  and Servicing Agreement.

  A.    Information Regarding Distributions to Class B
        Certificateholders (Stated on the Basis of $1,000
        Current Invested Amount).

    1.  The total amount of the distribution to Class B
        Certificateholders on the Payment Date, per $1,000
        interest...........................................$        1,016.042

    2.  The amount of the distribution set forth in paragraph
        1 above in respect of principal on the Class B Certi-
        ficates, per $1,000 interest.......................$        1,000.000

    3.  The amount of the distribution set forth in paragraph
        1 above in respect of interest on the Class B Certi-
        ficates, per $1,000 interest.......................$           16.042

  B.    Information Regarding the Performance of the Trust

    1.  Collections of Receivables.

        (a)  The aggregate amount of Collections of Receivables
             processed during the Due Period(s) with respect
             to the Payment Date...........................$   1,606,238,708

        (b)  The aggregate amount of Collections of Receivables
             in respect of Finance Charge Receivables processed
             during the Due Period(s) with respect to the
             Payment Date..................................$     170,980,866 [1]

                                       3
(c)  The aggregate amount of Collections of Receivables
             in respect of Principal Receivables processed during
             the Due Period(s) with respect to the Payment
             Date..........................................$   1,435,257,842 [2]

    2.  Allocation of Receivables.

         (a)  The Class B Floating Allocation Percentage for
              the Due Period(s) with respect to the Payment
              Date..........................................

              First Due Period......  8.45
              Second Due Period.....  8.56
              Third Due Period......  8.64
              Fourth Due Period.....  8.67
              Fifth Due Period......  8.71
              Sxth Due Period.......  8.73

         (b)  The Fixed Allocation Percentage...............    8.2516%      [3]

    ------------------------------------------------------------

    [1] Includes Interchange and Recoveries.

    [2] During  the  Revolving  Period,  this  amount  (or the  portion  thereof
        received prior to the occurrence of an Amortization  Event) will be paid
        solely to the  holders  of the  Seller  Certificate  or,  under  certain
        circumstances, will be used to fund certain payments with respect to the
        Class A Certificates.

    [3] Applicable  during the  Accumulation  Period and any Early  Amortization
        Period.

                                       4
3.  Available L/C Amount.

        (a)  The amount  available to be drawn under the
             L/C (the "Available L/C Amount") as of the 
             close of business  on the  Payment  Date,
             after giving  effect to any  drawings on the
             L/C and  payments to the L/C Issuer on such
             Payment Date..................................$     84,300,000

        (b)  The ratio of the  Available  L/C  Amount  to
             the  Class B  Invested Amount as of the
             close of business on the Payment Date 
             after giving effect to any drawings
             on the L/C and payments to the L/C Issuer
             on such Payment Date..........................               N/A

    4.  Delinquent Balances.

        (a)  The  aggregate  outstanding  balance  of the
             Accounts  which  were delinquent by 35 days
             to 64 days as of the close of business on 
             the last day of the calendar month preceding
             the Payment Date..............................$     32,776,292

        (b)  The  aggregate  outstanding  balance  of the  
             Accounts  which  were delinquent  by 65 days
             or more as of the close of  business  on the
             last day of the calendar month preceding
             the Payment Date..............................$     51,279,407

    5. Class B Investor Default Amount.

        The Class B Investor Default Amount for the
        Distribution Date(s) with respect to the Payment
        Date...............................................$        730,068

    6. Class B Investor Charge-Offs; Reimbursement of Charge-Offs.

        (a)  The aggregate of the Class B Investor Charge-
             Offs and other reductions in the Class B
             Invested Amount (other than due to the payment
             of principal to the Class B Certificateholders),
             if any, for the Distribution Date(s) with respect
             to the Payment Date...........................$              0

        (b)  The  amount  of  the  Class  B  Investor  Charge-  
             Offs  and  other reductions  in the Class B 
             Invested  Amount set forth in Item 6(a)
             above, per $1,000 interest (which will
             have the effect of reducing, pro rata, 
             the amount of each Class B Certificate-
             holder's investment)..........................$              0

        (c)  The total  amount  reimbursed  to the  Trust
             for such  Distribution Date(s) in respect of
             Class B Investor Charge-Offs and other
             reductions in Class B Invested Amount.........$              0

                                       5
(d)  The amount set forth in Item 6(c) above,
             per $1,000 interest, which will have the
             effect of  reinstating,  pro rata, the amount
             of each Class B Certificateholder's
             investment....................................$              0

        (e)  The amount,  if any, by which the out-
             standing  principal balance of the
             Class B  Investor  Certificates  exceeds
             the Class B  Invested Amount as of the
             end of the day on such Payment Date...........$              0

    7.  Servicing Fee.

        The  aggregate  amount  of the  Class B  Monthly 
        Servicing  Fee paid or payable by the Trust 
        to the Servicer for the Distribution Date(s)
        with respect to the Payment Date...................$       1,831,113

    8.  The existing Deficit Controlled Amortization
        Amount for such Payment Date.......................$              0

  C.    The Class B Pool Factor.

        The Class B Pool Factor for the preceding
        Record Date (which  represents the  ratio  of
        the  Class  B  Invested  Amount  as of such  Record 
        Date (adjusted  after taking into  account any  
        increases or decreases in the Class B Invested 
        Amount which will occur on the following  
        Distribution Date)  to  the  Class  B  Initial  Invested 
        Amount.)  The  Amount  of a Certificateholder's  pro 
        rata  share  of  the  Invested  Amount  can be determined
        by multiplying the original denomination of the
        holder's Class B Certificate by the Pool Factor.....            0.00%

  D.    Receivables Balances.

    1.  The aggregate amount of Principal Receivables
        in the Trust at the close of business on the
        last day of the preceding Due Period...............$  1,779,757,372

    2.  The aggregate  amount of Finance Charge 
        Receivables in the Trust at the close of
        business on the last day of the preceding
        Due Period.........................................$     26,321,698
     

                                                  CITIBANK, SOUTH DAKOTA
                                                  as Servicer

                                                  By: /s/ Joseph Mecca
                                                       ------------------
                                                       Name: Joseph Mecca
                                                       Title:Servicing Officer

                                       6
SIGNATURES

                 Pursuant to the requirements of the Securities  Exchange Act of
1934,  the  registrant has duly caused this report to be signed on its behalf by
the undersigned hereunto duly authorized.

                                          CITIBANK (SOUTH DAKOTA), N.A.,
                                          as Servicer
                                          Standard Credit Card Trust 1990-6

                                          By:  /s/ Eugene D. Rowenhorst
                                               --------------------------------
                                               Eugene D. Rowenhorst
                                               Senior Vice President

Dated: September 16, 1997

                                       7