Annual Calendar Moonphase

The Patek Philippe Annual Calendar Moonphase captures the brand’s mastery of elegant complications, offering a refined balance between everyday practicality and haute horlogerie. Introduced as part of the Complications collection, it was one of the first wristwatches to feature an annual calendar—a mechanism that only requires adjustment once per year, at the end of February. Collectors appreciate its understated 39mm case, which wears comfortably while showcasing the signature moonphase display and clean dial layout that have made this model a modern classic.

Reference numbers like 5146 and 5205 define the main variants, each bringing subtle differences in case shape, dial design, and layout of the calendar apertures. The 5146 is known for its traditional round case and Roman numerals, while the 5205 introduces a more contemporary look with a slightly more open dial and distinctive lugs. Both house the self-winding Caliber 324 S QA LU, prized for its reliability and slim profile, but dial color, precious metal choice (white, yellow, or rose gold, and platinum), and bracelet options drive price variation across the lineup.

When considering this model, pay attention to the completeness of the set—original box, papers, and accessories can add considerable value, especially for earlier references or precious metal variants. Condition of the moonphase disc and clarity of the annual calendar mechanism are practical points to check, as servicing these complications requires expertise. The Annual Calendar Moonphase is less prone to aftermarket modifications than sportier Pateks, but factory-correct dials and hands remain important for long-term value and collectibility.