A silver open faced keyless lever split seconds chronograph pocket watch, Swiss, circa 1920,

細節
A silver open faced keyless lever split seconds chronograph pocket watch, Swiss, circa 1920,
white enamel dial with Roman numerals, outer seconds divided into fifths, subsidiary constant seconds and minute recording dials, blued steel hands, frosted movement with compensation balance, silver cuvette with engraved name, polished case, diameter 53mm.