Preliminary calling this a Lady Maxim strictly because that's what's marked on the face. I have no clue about the date but I'm calling it pre-1923 because of the markings on the movement.
The movement is a IIB with 15 jewels marked "Bulova W. Co." Fifteen jewels would be consistent with Lady Maxim ads from the early 1920s. There's no date code that I can find. The case is marked "American Standard" and "Warranted 20 years". No patent date.
I received this watch by mistake after buying a different one that is in better shape. The seller is currently "looking around his work area" to try to find the watch I bought. This one is missing a lug and I'm not willing to accept it as an even exchange but it is interesting. I have made the seller an offer for it, though, and I haven't heard back.
As I understand is, movements marked "Bulova W. Co." are considered to be pre-April, 1923. There are no watches in the database with a "IIB" movement and its not in the "movement ranges" list on the site. So, assuming you guys think it's genuine, I really have no idea of the date. I will be very interested to hear your thoughts.