Balance cock marked BXW and marked M4 on the barrel bridge next to the ratchet wheel. Unadjusted, Bulova Watch Co.
Case marked:
<li>Bulova M4
<li>10K Rolled Gold Plate






I agree that this should be dated to 1964.
I also found several different variants for this style:
H in 64
G in 65-66
K in 67
I think we can rule out the H, since it is a white gold version, but it does look to show a dial with the groove-like pattern. The other ads show a simple dial, or perhaps just lack enough detail.
The subject watch could be either the G or K, but we don't know which is yellow or white; and the subject watch looks to be a combination of white and yellow, which could also be another variant not found in ads.
I would go with First Lady no variant
Hello Midesigns, welcome to myBulova, this certainly is a beautiful little watch. She looks like she's been treated very well. Is it possible to get a photo of her all put together?
I'll go along with the First Lady ID as well (nice work Ken)
Dodecagon...now there's a word I rarely use!
In reply to Hello Midesigns, welcome to by Geoff Baker