I don't know much about the watch. It was in my late grandfather's collection and no one could tell me anything particular about it. He lived in Mexico but his family came from Europe and the watch might have traveled with them. I didn't try to open the case so I don't have any information about the movement but I can try to open it up if more information is needed. The dimensions are 21.9mm wide, 28.6mm tall for the main body. There's a stamp on the bottom of the case which I believe says 10k R.G.P. and has a e in a diamond. If I wind it, it will tick for a short period of time before stopping. Besides that I and what's in the photos I don't have any other information about the watch.
Welcome to myBulova and thank you for sharing your father's watch with us. Your watch is what we call "Non-Conforming". Meaning it is a mix of Bulova and Non-Bulova parts. As such we can not match your watch to a model name. I would place this watch around the late 40's or early 50's. If you could get a photo of the movement that might give us a date code that would confirm the date. It does not diminish it as a wonderful heirloom, enjoy it!!
Non-Conforming