This is apparently a Ladies pocked watch that was converted to be worn as a wrist watch. No date symbols on the movement and the only serial number is on the case. Currently runs and stops so needs a good cleaning.
Case is 25.78mm dia. 8.16mm thick
Crystal is 19.71mm
With the 20 year warranty on the case I am assuming that it is 10k gold filled
In reply to FWIW, There are a lot of by Reverend Rob
....and they are worthless to you without the names on the dials. You should ship them all to me right away...and I'd even pay for the postage. You'de have more storage space that way too.
In reply to ....and they are worthless to by William Smith
Hey William, I would like to get in on that also. HA HA
An ID at last guys.
The 150-B, 1922 ad.

Thanks Bobbee, concur and updated.
...and another similar 1922 ad
and Bobbee found a 1922 ad for the 150 (not "B" variant, and not on the strap above) w/ Lady Maxim on the dial.
Looking at this one again, I would have to say Lady Maxim.
In reply to Looking at this one again, I by bobbee
You said that about a year ago....maybe just not for this particular watch. You said something like:
Lady Maxim is model (series) name, and the model numbers are similar to variants we use in later watches.
So subject watch would be Lady Maxim variant/model number 150-B.
I think they advertised them both ways- as numbers and/or (series) names.
What do folks think about "Lady Maxim 150-B" for subject watch ID?
I still suspect that these early models where produced on mass prior to 1922 in time to coincide with Bulova's first ever major newspaper marketing campaign that occured around Oct-Nov-Dec 1922, in time for christmas.
FLAG !!!
By case s/n this one should be a 1920.