I am pretty sure this is a Dictator model.
Inside of case back reads:
Pat. June 10, 1924
Bulova
14K Gold Filled
New York
Movement is a running 17 Jewel 8AN movement
I dated this to 1928 based on the case serial number and the movement is a 1927 date based on the square date code.
All of the hands are replacements that are incorrect and when I send this out for service I plan to get the dial refinished to orignal with lume and add a pair of the cathedral styled luminescent hands to go with it.
Something to keep in mind with the vintage ads is that the "Federal Truth in Advertising Act" wasn't passed until 1966.
So exaggerations to help promote products or perceptions were very common.
While this example doesn't have the extreme curve that the other advert shows, the lugs, jewel count and case style look to be a good match.
In reply to BTW, does the crystal curve, by bobbee