I just got back from the watchmaker my art deco Roamer, which was serviced and had a little cleanup on the dial and crystal. I found some more information as well. It has a MTS 253 six-jewel, 2 adjust., movement at 18000 beats and manufactured from 1925 to 1933. It was replaced by the MTS 277. It features a La Salle case and the design is similar to the Bulova Conqueror and the Roamer cut-corner case. The case dimensions are about 26mm wide excluding crown and 37.5mm lug to lug. I'm guessing this watch is from around 1930 given the dial design. So, demonfinder, you were right on the money (Thanks to the Vintage Roamer Watch Site).