1934 Alexander - Running with 1/2 a service. Movement 10AR 7 Jewel, w/ Triangle & Square stamped in it. Glass crystal - Dial ,so so. Looks fine by me. Cut to fit Band off a no frills art deco watch/ throw away.. 10k inc/snap back.
Agree with Alexander similar as this one

Dear Advisors, is there a movement I can replace the 10AR 7 jewel thats in there since it's pretty well shot (rust) and keep it conforming/original ?
Alexander
Either 10AN, 10AE, 10AX would probably do the trick for a 15 jewel movement and a 10AB (if you can find one) for a 7 jewel movements. It's funny that the 7 jewel Bulova movements are rarer than the 15, 17 jewelled movements.
In reply to Either 10AN, 10AE, 10AX would by mybulova_admin
I'm doing up a 10AE 15 right now. I really want it to be conforming /
In reply to I'm doing up a 10AE 15 right by shelton243
Go for a 1935/36 Bulova 10AE movement.
In reply to Go for a 1935/36 Bulova 10AE by mybulova_admin
Sounds good to me. I have one all done up .
Alexander it is.