Patek Philippe 5036 (Pre-owned - Good) — USD 43,280 on eBay

The Patek Philippe Annual Calendar Reference 5036 represents the manufacture's first annual calendar wristwatch, establishing this complication within the brand's lineup. Produced from 1996 to 2004, the 5036 introduced the annual calendar function in wristwatch form, requiring manual adjustment only once per year in February. The 36.5mm case is available in 18k yellow gold or white gold, fitted with a smooth bezel and sapphire crystal. Water resistance is rated to 25 meters. The automatic Caliber 315/190 movement provides 48 hours of power reserve. The watch is completed with a leather strap. Reference 5036 appeals to collectors seeking Patek Philippe's entry into annual calendar complications in wristwatch format. The 36.5mm case size reflects period-appropriate proportions, while the eight-year production run established the foundation for subsequent annual calendar references. The combination of precious metal cases and automatic movement positions this reference within Patek Philippe's complicated watch segment.