Perpetual Calendar 3970

Successor to the 2499 in a smaller 36 mm case with round pushers, on a Lemania 2310-based movementMovementThe working mechanism inside a watch or clock.. New leap-year display in the 3 o’clock counter and 24-hour display in the 9 o’clock seconds dial; no tachymeterTachymeterA chronograph scale that converts the time taken to travel a known distance into average speed. The distance and scale units must correspond. on regular production. Six faceted batons, square markers at 3, 5, 7 and 9 and a double index at 12.