Technical Details & Model History

• Case: 18 kt rose gold, 36 mm diameter
• Movement: automatic Patek Philippe caliber 240 Q
• Complication: perpetual calendar
• Indications: day, date, month, leap year, moon phases and 24-hour indication
• Strap: brown crocodile leather strap
• Buckle: original Patek Philippe buckle in 18 kt rose gold
• Double caseback: two interchangeable original casebacks, one in sapphire crystal and one in solid 18 kt rose gold
• Reference: 3940
• Year: 1992
• Accessories: complete original set, including the original presentation winder box
• Documentation: Patek Philippe Extract from the Archives
• Condition: exceptional, virtually like new

Key Features

• Rare Patek Philippe Perpetual Calendar ref. 3940 from 1992 in rose gold
• Refined 36 mm case in 18 kt rose gold
• Prestigious ultra-thin automatic caliber 240 Q with micro-rotor
• Perpetual calendar with leap-year indication and moon phases
• Two original interchangeable casebacks: sapphire crystal for viewing the movement and solid 18 kt rose gold
• Brown crocodile leather strap with original Patek Philippe rose gold buckle
• Exceptional condition with complete original set, presentation winder box and Patek Philippe Extract from the Archives

Patek Philippe 3940: An Icon of the Perpetual Calendar

Introduced in 1985, the Patek Philippe Perpetual Calendar ref. 3940 became one of the defining watches of the Geneva manufacture during the second half of the 20th century. Its remarkably balanced proportions and harmonious arrangement of multiple calendar indications have established it as a benchmark among automatic perpetual calendar wristwatches.

At the heart of reference 3940 is the celebrated automatic caliber 240 Q, an exceptionally refined ultra-thin movement featuring a micro-rotor and perpetual calendar mechanism. The complication displays the day, date and month while automatically accounting for months of different lengths and leap years, complemented by moon phases, a leap-year indicator and a 24-hour indication.

This rare 1992 example is crafted in 18 kt rose gold and retains both of its original interchangeable casebacks: a sapphire crystal display back that reveals the beautifully finished caliber 240 Q and a second solid rose gold caseback. The brown crocodile leather strap is paired with its original Patek Philippe buckle in matching rose gold.

Particularly noteworthy is the extraordinary state of preservation: the watch remains virtually like new and is accompanied by its complete original set, including the distinctive presentation winder box, as well as a Patek Philippe Extract from the Archives. This exceptional combination of rarity, condition and completeness makes this ref. 3940 an especially compelling example for the discerning Patek Philippe collector.