A gold open faced keyless lever pocket watch, Omega, circa 1920,

细节
A gold open faced keyless lever pocket watch, Omega, circa 1920,
white enamel dial with Arabic numerals and red outer 24-hour ring, subsidiary seconds, moon hands, frosted gilt movement jewelled to the third and with compensation balance, polished case with engraved crest and motto Semper Fidelis, dial, movement and case signed, diameter 49mm.