Unable to locate an ad with what appears to be a Senator case and this dial (two tone with Roman numerals). There is a 1940 Senator of similar or like description in the database;
Movement date code is an asterisk, although perhaps hard to distinguish. A close-up is available.
10K Rolled Gold Plate, Stainless Steel Back;
Signed Bulova: Dial, movement, inside case back;
Unsigned crown measured: 5.25mm (digital caliper);
The crystal is perhaps a replacement given the height and noticeable gaps in at least two corners.