Perpetual Calendar | 25657PT | Platinum collectables well-defined hallmarks and engravings on

well-defined hallmarks and engravings on the caseback

reminiscent of the shape of a Malte Cross

Habring² x Massena LAB

Denis Flageollet

The Patek Philippe inner box lining has begun to crack and show signs of deterioration

Perpetual Calendar | 25657PT | Platinum collectables well-defined hallmarks and engravings onFirst launched in 1978, the Quantime Perptuel by Audemars Piguet was the worlds thinnest automatic perpetual calendar. The reference 5548 was the first reference of this newly released perpetual calendar, birthing a category of watches which has taken on many different forms. Sources note that total production for the reference 25657* stands at 1821 watches, with just 128 in platinum, making this example fairly rare and not often seen on the market.