Perpetual Calendar Secondi al Centro 2438/1

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. sister of the 2497 in a Wenger case: the first 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. perpetual calendarPerpetual calendarA calendar mechanism that accounts for different month lengths and leap years. made in series and one of the rarest Patek perpetuals. Centre seconds, day and month windows, with date.