I was just given this watch as a gift from my father. No history accompanied the watch, but it has been serviced and runs beautifully. I was told it is a 1929 model, and the Shield symbol along with the case serial number beginning with a 9 would seem to back that up. The case is two-tone with an art deco design on the front and sides. This mystery watch model looks like the Ambassador, Revere, Senator, Brewster and Executive merged together. I would love to know more about this timepiece!
It appears in the following ad. If only they had included the model name!