jmapb
Thanks for checking. Iirc I never found a Dale Ave sign at all, but I might have missed it.

The current online map https://www.green-wood.com/wp-content/uploads/2018/10/alive-at-g-w-map.pdf calls the portion between Crescent Water and Summit Ave "Vale" and doesn't label portion between Summit Ave and Southwood Ave. Meanwhile the older map at https://mapcollections.brooklynhistory.org/map/map-of-the-green-wood-cemetery-a-national-historic-landmark-founded-1838-brooklyn-new-york-3/ calls the whole thing "Dale" as is currently mapped.

The original changeset cites "Yahoo" as a source but my guess is that's just the source for the road alignment (we used to have access to Yahoo aerial imagery) not the road names.

I guess I'll leave this note open for now in hopes of further clarification.