Movement has date of M3, while outside back has M1 - not sure which is the manufacturing date
I believe your watch is an International model, likely not sold in the U.S. There is no import stamp on the balance bridge, and we see the serial number starting with a 1-.
Closest match I could find is this example, but it is gold plated. I could not find a stainless steel example.
1963 International linebook153
I have to say the international models are very nice clean and contemporary for the time.. While I agree it’s an international model, which is clearly printed on the casebook, I don’t think we can assign it a model number because of the case color difference. I think we just need to stick with 1963 Bulova International.
I missed the fine print...the bit that says "YELLOW" !!!!
Looking at the other models referenced, they do say "40 Micron Bezel" for the yellow versions, but there is no mention of micron for the white, which suggests all SS case..
Probably best to leave out the model number...agreed.