Case back:10K ROLLED GOLG PLATE,BULOVA,L6 and serial #
Inside case back:BULOVA,FI FTH AVE,NEW YORK
8AC movement is dated L6
Dial has applied gold 12 and squares and darts for the other #'s,sub seconds is just a crosshair.
I didn't find an example of this one in the database or in the ads but Lisa has one ine her database marked as unknown.Pretty distinctive case with those camel humps on each side.