Tank Américaine 1730

Tank Américaine ChronographChronographA watch function for starting, stopping and resetting an elapsed-time measurement independently of the ordinary time display.: water-resistantWater resistanceA watch’s ability to resist water entering its case under specified conditions, often stated as a pressure or equivalent depth. Seals can deteriorate and the crown can be damaged, so an original rating does not establish a vintage watch’s present resistance. curved yellow-gold case of 26 × 44 × 8 mm with square pusher, eight-screw back and sapphire crown; 12-hour and 30-minute registers and pointer date on a matt silver dial with secret signature.