Audemars Piguet Quantième Perpétuel Automatique

About this reference

The Audemars Piguet Quantième Perpétuel reference 25668PT was produced between approximately 1989 and the mid-1990s as a skeletonized variation of the classic 25657. Collectors value this reference for its 36mm platinum case and the ultra-thin self-winding caliber 2120/2800, which features a hand-finished, openworked movement visible through sapphire crystals on both the front and back. Unlike the solid-dial versions, the 25668 utilizes transparent sub-dials for the day, date, month, and moon phase, showcasing the intricate perpetual calendar mechanism. Production was limited, with fewer than 100 units estimated in platinum. On the secondary market, this reference typically trades in the $60,000 to $90,000 range depending on provenance and condition. A notable production detail is that early examples often lack the leap year indicator, a characteristic of the caliber 2120/2800 before the movement was updated in later years.