I believe we have a Roberta.
In reply to This model changed name from… by Alex
Here are my findings after studying the Saturday Evening Post adverts I have. (flat/round refers to the inner minute track flat top Vs round top).
Geraldine Jun 1926, flat $40
Geraldine Oct 1926, flat $40
Geraldine Dec 1926, flat $40
Geraldine Jun 1927, flat $40
Roberta Dec 1927, round $37.50
Roberta Feb 1928, round $37.50
Roberta Apr 1928, round $37.50
Based on this I'd say the watch is a 1927 Bulova Roberta, with a cut over date sometime in the second half on 1927, or at Dec 1927.
Bulova never ceases to surprise. A clear inconsistency here: although this model is introduced in the Saturday Evening Post (SEP) in June 1926 as Geraldine, this model was never advertised as Geraldine in the newspapers! First ads appear in December 1926 as Roberta (the snippet above posted by mybulova_admin) while the SEP continues to advertise it as Geraldine. Then again I found one Roberta ad in June 1927 and then from November onwards many ads can be found into the next years. So, what do we take as leading here: the Bulova ads in the SEP or the jeweler ads in the newspapers? I would say we follow the SEP ads, meaning it is Geraldine until 6 June 1927, and then Roberta as from there. The 725 serial is from the last quarter of 1927, so I would go for Roberta.