Case is 14K white gold-filled. Back of case includes patent date (Pat. June 10, 1924). Radium dial. Cathedral hands. Band is a Sturdy-brand open link design with folding ratchet buckle. As movement and case are only 1 year apart, I suspect that it's a 1930 model using an older case, and not a 1929 model with a replaced movement. 5th digit of case serial is incompletely stamped and could be 3, 8, or 0, but is likely 0, based on hand-scratched numerals on the inside of the case that match the last 3 of the case serial (X V VIII).
I suspect that it's a Douglas, based on other models I've seen here and elsewhere, as well as the advert.
Yes 1930 Douglas it is, I´ve similar watch from 1928

I dont think it is the Douglas. The corners of the subject watch come together in a 45 degree angle like the Magnolia and Windsor. Those of the Douglas are perpendicular. But the Windsor had a 7T movement. So I need to research a bit further. Will be back soon.
We have another example, the shape of the case is the same
I'm in for a 1929 Bulova Douglas. I think the advert does not depict the corners that well with regards to the angle, but it is certainly a very close match to the subject watch.
I suspect that the dial lume is original, if so that thing is still hot!!
In reply to I'm in for a 1929 Bulova by mybulova_admin
The lume photo was taken under UV. It doesn't hold a charge for more than a few seconds in the dark unfortunately.
Yes, I researched further but couldn't find anything. So go for Douglas as well.
I agree with a Douglas ID as well, I think it dates to 1930 per the omega (1930) date code.