My wife found this one, called me to her computer and said "you need to buy this one!" I had to agree.....God bless her..... Single piece screw on back as well as case itself is identical to the 1964 Bulova 30 "DW". The only marking on the inside of the stainless case back is the number "2421"
Gilt dial is textured like linen and sports 20 diamonds in white gold mounts. Case is yellow gold plate, which seems unusual.
No doubt it's a Beau Brummell, but I have yet to track down a variant. It's one I personally have never seen before.
30 jewels and 20 diamonds. It came out of the package running and is keeping time; but was horrible filthy on a crud caked replacement band with a multitude of crystal scratches. It cleaned up much better than I anticipated.