Marked on movement as 3adj. Bulova WC. Swiss. And also has a triangle with the number 21 in it. Also says 14k gf on sterling on the watch clasp. It does seem to work when I wind it up. I am no expert at all.
I agree, it's all Bulova and certainly a 1921 Lady Maxim. Added photos are just what we needed.
Slindley2012, I think your fortunate to have this lovely keepsake from your Grandmother, I hope you have fond memories of her as well. I'm a big fan of heirlooms, this is a wonderful example, congratulations.
The Triangle in the Movement Symbol field is not referring to a date code, but another symbol we see on some of these early movements . Other examples are usually little trapezoids or triangles w/ some number(s) inside. The Bulova W. Co sig indicates the movement pre-dates the known date code system. Maybe we change from Triangle to None?
Edit: I think I'm seeing the globe on the inside case back?
In reply to The Triangle in the Movement by William Smith