Patek Philippe 5004 (Pre-owned - Excellent) — USD 750,000 on eBay

The Patek Philippe Reference 5004 was a significant grand complication produced from 1995 to 2011, succeeding the Reference 3970. It integrated a split-seconds chronograph with a perpetual calendar, moon phases, and a 24-hour indication, positioning it as a highly complex and desirable piece within Patek Philippe's complicated watch offerings. The reference was produced in various metals, with the platinum version, 5004P, being particularly sought after. This reference features a 36mm case, typically crafted from platinum, yellow gold, rose gold, or white gold. It houses the manually wound Caliber CHR 27-70 Q, based on a Nouvelle Lémania ébauche, which is further enhanced with Patek Philippe's perpetual calendar and split-seconds chronograph mechanisms. The movement operates at 18,000 vibrations per hour and offers a power reserve of approximately 60 hours. The Patek Philippe Reference 5004 is highly regarded by collectors for its intricate mechanical complexity and its relatively limited production numbers. Its combination of a split-seconds chronograph and perpetual calendar places it among the most technically sophisticated wristwatches of its era, making it a cornerstone for serious collectors of Patek Philippe grand complications.