unknown model and date. Would be happy to learn more.
Based on the information I found on this site I think it is 1935. I remember my grandmother wearing it when I was a child.
Welcome, and thanks for sharing your heirloom with us. It looks to me like the date stamp on the movement is a shield (to the left of the word "adjusted" in your photo), dating the movement to 1939. The case is a replacement and not Bulova, so the triangle stamped in the case back has no meaning.. This happened a lot; the case would get worn out or damaged, and taken to a jeweler for a "sprucing up" to rejuvenate an old friend. There were a lot of companies making replacement cases to fit watch movements by size.
Base on the replacement case, we would call your grandmother's watch a "non-conforming" meaning it can't be identified as a specific model. No matter, it has a family history. It would be cool to know if she bought it new and wore it until it needed an new case or bought it as a second hand/restored trade in from a jeweler.
1939 Non-Conforming
Based on the movement size and the time period, this likely started out as a man's watch.
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In reply to Non-conforming as the case… by mybulova_admin
In reply to Just to be clear: the entire… by WendellD
I would say the entire case. Most watch movements were manufactured as a certain linge size. That meant the movements could (in many cases...excuse the pun) fit into non-original cases.
Front bezels and their case backs were however made as a pair, so it isn't likely that the bezel and backcase were married.
Whilst the case is similar to stepped cases of the era, this one deosn't match any known model, and the inclusion of a 3rd party case back, suggests the entire case isn't a Bulova case.