time being I have not found any matching advert
Looks like a Debutante to me Jabs. Nice find. Introduced in this shape in 1927, and advertised regularly in that year. The December 1927 ad with all the many watches has the Debutante in it. I am mobile so cannot get the ad in this text somehow.MAybe someone can help
it's probably really Debutante, stopped me a little difference dial style that matches the models Debutante into 1926 and the case shape that corresponds Debutante models from the years after 1927, at least according to our adverts
to 1926 
from 1927 
Jaroslav, I think it's a Debutante too. I'm not sure the center dial and hands match but the case looks correct.
more attach a snapshot dial, it seems to dial in another case was not
Panel Members, your thoughts?
For me the case is definitively Debutante. The hands seem different from the ad, but those hands I have seen actually only once, while the hands of the subject watch I have seen several times, albeit on several Juliana's and a Wimbledon. And those ads dont show the subject hands either. So although the hands are not advertized, they seem to be original. Hence I am fine to go for Debutante.
1929 Debutante