EXTREMELY RARE EXTRA-FLAT GOLD WATCH WITH REVERSE KEY, SWISS CIRCA 1820 extra-flat gold case, diameter 42 mm, decorated in the case middle with leaf motifs, guilloché case back centred with flowers, guilloché silver dial, Breguet-style steel hands, extremely rare extra-flat movement with lowered cylinder escapement, integrated in the movement plate, decorated movement with reverse key winding (fits into the winding holes), with original gold key Total weight 33.8 g EXTRA-THIN, 18K GOLD POCHET WATCH WITH A GOLD REVERSE KEY, SWITZERLAND CIRCA 1820