All I could find:
BRASS RADIO ROOM DECK CLOCK FOR U.S. MARITIME COMMISSION,
WWII era, unmarked, of solid, polished red bronze; 12/24 hour spun brass 6" dial face with second bits at 12 o'clock, black enamel spade hands and numerals, fast-slow regulator, marked with red sectors which reflect periods of silence observed by radio operators to monitor airwaves for distress signals; 7" diameter across screw bezel and 7.25" across mounting flange. Dial engraved and painted in black letters
U.S. Maritime Commission.