A silver open faced keyless lever pocket watch with calendar and moonphase, Swiss, circa 1910,

細節
A silver open faced keyless lever pocket watch with calendar and moonphase, Swiss, circa 1910,
white enamel dial with Roman numerals and outer Arabic five minute markers, subsidiary day, date and month dials and subsidiary seconds with combined moonphase, frosted movement with bimetallic compensation balance, engine turned case with vacant cartouche, diameter 50mm.