Patek Philippe 5050 (Pre-owned - Excellent) — USD 57,950 on eBay

The Patek Philippe Reference 5050 introduced a significant design element to the brand's perpetual calendar offerings: the retrograde date display. This reference was notable for being the first Patek Philippe wristwatch to feature a retrograde date, a complication that sees the date hand sweep along an arc and then instantly spring back to the beginning of the month. It represented a modern interpretation of traditional calendar functions, distinguishing it from other perpetual calendar models that utilized sub-dials for date indication. This innovation provided a cleaner dial aesthetic while maintaining full calendar functionality. Crafted in 18k yellow gold, the case of the Reference 5050 measures 36 mm in diameter, offering a balanced presence on the wrist. The watch is powered by the self-winding caliber 240 Q, a movement known for its slim profile and micro-rotor construction, which allows for a more compact case design. This movement provides a power reserve of 48 hours. The dial is protected by a sapphire crystal, and the watch is water-resistant to 25 meters, suitable for everyday wear. For collectors, the Reference 5050 holds importance as the progenitor of Patek Philippe's retrograde perpetual calendar lineage. Its introduction marked a new chapter in the brand's exploration of calendar complications, appealing to those who appreciate both technical innovation and classic design. The reference was produced from 1993 to 2008, and while the initial models featured the caliber 240 Q, later iterations sometimes incorporated the caliber 315 S QR or 324 S QR, reflecting ongoing movement developments within the brand.