Amber, curved, 27.1 x 13.8mm, MX432
Curved shape, Omega date mark (1940), bought 1999 in Palo Alto, CA for $250. "B-10K Gold Fill" on case.
Watch has a white face, appears yellow through amber crystal. Watch is 9.5/10 functional and aesthetic condition. Crystal size is an exact match for MX432, which corresponds to the "Palm Beach", the original designation of this watch.
However, in August, 2012, an ad surfaced which almost certainly demonstrates that this watch is the 1939 Marshall model.
Pix of the movement and inner case are available in the comments section.
Many heartfelt thanks to the denizens of MyBulova, who generously shared their time and expertise to help ID this watch!
EDIT 2012.08.09. Changed from 1939 Palm Beach to 1940 Marshall by request of owner. Will Smith