- Automatic movement marked 'Selfwinding' on dial
- Matching date on movement and case (M0)
- Date window
- All stainless steel case - 33.5mm w/o crown x 39.8mm; 17.6mm between lugs
- Silvered dial and indices; engine turned center, smooth outer chapter with alternating even numbered Arabic numerals with arrowhead styled indices.
Nice watch, Timeless, and nice job on listing the details and posting great pics.
I note that your watch has the outside only Bulova case signature typical of the 1960s. It appears to be all Swiss made, which would explain the unusual serial number.
I'm curious to know when Bulova began marketing/making date watches. I haven't noticed anything prior to 1960 in the posted advertisements.
mid 1950's - the '23 Calendar'.
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Member Stodrob had one Dated '54 or '56 and I've seen similar.
Mid 50's and the Calendar 23 was the first.
database ad is from 1959 incorrectly labeled 1960.
In reply to Member Stodrob had one Dated by FifthAvenueRes…
I'm pretty sure stoddrob had a few posts w/ goos pics of his 50's calendar watches...if they remain on site.
In reply to Member Stodrob had one Dated by FifthAvenueRes…
Actually, that's incorrect, Fifth.
There was at least one calendar model produced prior to the Calendar 23. Here's the 1952 ad:

In reply to Actually, that's incorrect, by NOVA
Yes, and way before 1960 - Can You confirm 1952 Lisa or is this another estimate?
Stunning watch, timeless, Love that Guilloche centre, very attractive.
Thanks for the comments, all. Happy to be able to add an example of this for the database, and with the hope that soon it will have a name other than 'unknown'. : )