Patek Philippe Split-Seconds Perpetual Calendar

About this reference

The Patek Philippe Reference 5004 was produced between 1994 and 2011, with the 5004R-018 variant featuring an 18k pink gold case and a silvered opaline dial. This reference is technically significant as the brand’s first serially produced split-seconds perpetual calendar, housing the manual-wind Caliber CHR 27-70 Q based on a Lemania ébauche. Collectors prioritize this model for its 36.7mm case proportions and the complexity of its split-seconds mechanism, which required a specific isolator system to prevent drag. Total production across all metals is estimated at approximately 12 units per year, making the pink gold execution relatively scarce. On the secondary market, the 5004R typically trades in the $250,000 to $350,000 range depending on provenance and the presence of the original second solid caseback. A notable production milestone occurred in 2011 with a final 50-piece edition in stainless steel.