Vaucher No.13143: An unusual silver calendar verge pocketwatch in double sided glazed drum-shaped case, the white enamel dial with eccentric chapter ring with Arabic numerals, subsidiary dials for running seconds and date, inset glazed compass, the reverse with engine-turned silver cover with glazed window revealing the chased and engraved bridgecock with mock pendulum, signed and numbered on a sector, the frosted gilt fusee movement numbered under the back plate