Patek Philippe 3940R Perpetual Calendar: A Collector's Rose Gold Grail

The Patek Philippe Reference 3940 is a perpetual calendar wristwatch that was introduced in 1985, succeeding the Reference 3450. It is notable for its relatively slim profile and the integration of a perpetual calendar complication in a refined case. This reference became a cornerstone of Patek Philippe's complicated watch offerings for nearly two decades, establishing a design language for subsequent perpetual calendar models. It represents a significant period in the brand's modern history of complicated timepieces.

The watch features a 36mm case, typically crafted from yellow gold, rose gold, white gold, or platinum. It houses the self-winding Caliber 240 Q movement, which is known for its micro-rotor construction, contributing to the movement's thinness and allowing for a slimmer case profile. The movement provides a power reserve of approximately 48 hours. The dial is protected by a sapphire crystal, often accompanied by an interchangeable solid case back and a sapphire display back.

Reference 3940 is highly regarded by collectors for its classic proportions and the enduring appeal of its perpetual calendar display, which includes day, date, month, leap year cycle, and moon phases. It was produced in several series, with subtle variations in dial layout and typography, making early series examples particularly sought after. The reference is considered a benchmark for perpetual calendar watches and remains a significant piece for those appreciating traditional horological complications.

Patek Philippe Perpetual Calendar Reference 3940R

The reference 3940R represents Patek Philippe's 36mm rose gold perpetual calendar offering within the brand's complicated watch collection. This reference features a moon phase complication alongside the perpetual calendar function, positioning it as a multi-complication timepiece in the manufacturer's lineup. Production spanned from 1985 to 2006.

The 36mm case is crafted from 18k rose gold with a polished bezel and sapphire crystal. The watch is powered by the automatic caliber 240 Q movement, providing 48 hours of power reserve. Water resistance is rated to 25 meters, and the timepiece is fitted with a leather strap.

This reference appeals to collectors seeking a precious metal perpetual calendar in a compact case size. The rose gold construction and extended 21-year production period make it a substantial entry within Patek Philippe's complicated watch offerings. The 36mm diameter provides a more restrained profile compared to contemporary perpetual calendar sizes.