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Audemars Piguet Vintage Perpetual Calendar Moonphase – Ref. 25657BA – 18k Yellow Gold – 1989 – AP Service 2025 – Very Early Model - No.2

We are pleased to offer this elegant vintage Audemars Piguet Perpetual Calendar Moonphase Reference 25657BA  in 18k yellow gold and dating to 1989. This very early example (No.2) of the iconic ultra-thin QP line combines classic AP proportions with one of the most refined perpetual calendar movements of its era. The watch benefits from a full Audemars Piguet Service in 2025, ensuring reliability and performance to factory standards.

The 36 mm yellow-gold case displays the understated sophistication that defines AP’s dress complications of the late 1980s—slim, balanced, and beautifully finished. This piece features an exchange dial installed during service, executed in the clean, modern AP style with beautifully proportioned calendar displays and a detailed moon-phase at six o’clock.

Powered by the legendary ultra-thin Caliber 2120/2800, the watch represents one of the finest perpetual calendar movements ever produced, appreciated for its elegance, mechanical finesse, and timeless architecture.

Presented in excellent condition, this Ref. 25657BA is a wonderful opportunity to acquire an early-model AP perpetual calendar with a fresh factory service and a modern, exchange dial.

– AP Service 2025 

- Two years of AP warranty

“A classic and iconic expression of Audemars Piguet’s mastery of ultra-thin complications — refined, collectible, and mechanically exceptional.”