Patek Philippe Retrograde Perpetual Calendar Ref. 5159G-001

Case and Dial

The reference 5159G-001 is constructed with a 36mm white gold case designed in the 'Officer-style', a hallmark of this model's aesthetic. The case architecture incorporates a stepped bezel and utilizes a sapphire crystal for protection. The white dial displays applied indices and 'Spade' style hands, providing a clear interface for the various calendar complications presented on the face.

Functionally, the dial features day and month apertures positioned to allow for easy reading, while a moon phase display is located at the six o'clock position. The primary complication is the retrograde date display, which utilizes a dedicated hand to track the date along an arc before resetting to the beginning of the month.

The watch is secured with a brown alligator leather strap, which includes the brand's signature, and is fitted with a white gold deployant clasp for ergonomics and security.

Movement and Complication

This timepiece operates as a mechanical perpetual calendar, functioning to manage varying month lengths including those with 30 and 31 days, as well as the transition of February during leap years. The movement functions through a coordinated system of springs, levers, and gears, deliberately excluding electronic circuitry.

The specific integration of the retrograde date display, coupled with the calendar system, provides a distinct structural arrangement compared to other Patek Philippe perpetual calendar models.

Provenance and Accompaniments

The watch is offered as a complete set, including the original box, instructional booklets, and the manufacturer's Certificate of Origin.

All historical and technical claims regarding the watch are attributed to the provided source. Independent verification of the mechanical condition or the specific provenance of this individual unit is not provided by the current documentation.