Patek Philippe 3940P Perpetual Calendar Reference Guide

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.

The Patek Philippe Perpetual Calendar reference 3940P represents the platinum variant within the 3940 series, distinguished by its white dial configuration. This reference was produced from 1985 to 2006, offering collectors a precious metal interpretation of Patek Philippe's perpetual calendar complication in a 36mm case format.

The 3940P features a 36mm platinum case fitted with a smooth bezel and sapphire crystal. The automatic caliber 240 Q movement provides 48 hours of power reserve, while the white dial creates contrast against the platinum case material. Water resistance is rated to 25 meters, and the watch is completed with a leather strap.

This reference appeals to collectors seeking a precious metal perpetual calendar in the more compact 36mm case size. The platinum case material and white dial combination offers a specific aesthetic within the 3940 series production run. The two-decade production period from 1985 to 2006 provides multiple vintage options for collectors focused on Patek Philippe's perpetual calendar offerings.