This one threw me at first. No Date stamp anywhere on this guy. A weird back not branded on the outside, but does have a stamp on the inside caseback.
I see at least one other example od the word caseback. I'm going to-date this early 1954, the first year thr Bulova 23 came out. As it's stainless sporting a black dial are we looking at the "Bulova 23 A"?