I just finished this one today, late 1920s - very similar design to many US designs of the period. Black enameled decorative bezel with a fancy dial, lume to numerals and hands.
This Roamer was intended for the US market - and is quite different to the staid watches sold in the UK.
Fitted with a 7 jewel MST 264 movement, and NOS Camel strap. The watch needed a good clean, new staff and hands (hands are period NOS).
Movement here: http://roamer-watches.info/MST264.shtml