Preliminarily calling this a 1928 Envoy. The ad is 1929 and to me it looks just like it.
Case is rolled gold plate. Its marked Bulova New York with a Jan 11, 1927 patent date. The movement is a 15J 10AN, consistent with others in the database.
A little mark in the upper left hand corner of the face but otherwise, its pretty clean, I think.