COURVOISIER, RARE EXTRA-FLAT POCKET WATCH, SWITZERLAND CIRCA 1840 19 k yellow gold case, diameter 43 mm, back finely decorated with polychrome champlevé enamelling on a guilloché background. Signed dust cap. Rare extra-flat silvered movement finished with punches, extra-fine Swiss anchor escapement. Non-functioning watch to be serviced (only dirty). Weight 40.5 g COURVOISIER, A VERY RARE EXTRAFLAT 18K YH POCKET WATCH, CIRCA 1840