Perpetual Calendar Secondi al Centro 2497

Launched in 1951 next to the 2499: the first Patek perpetual calendarsPerpetual calendarA calendar mechanism that accounts for different month lengths and leap years. with centre secondsCentre secondsA seconds hand mounted on the same axis as the hour and minute hands., in a stepped case with fluted lugs like the 2499’s. Shares its 179-piece movementMovementThe working mechanism inside a watch or clock. batch with the water-resistant 2438/1, of which about two-thirds went into the 2497.