IWC 5002 (Pre-owned - Good) — USD 19,500 on eBay

The Patek Philippe Sky Moon Tourbillon reference 5002 stands as a highly complex double-faced wristwatch within the brand's grand complication offerings. It integrates a significant array of functions, distinguishing it as a flagship model for collectors interested in horological complexity and traditional craftsmanship. The reference is notable for its comprehensive display of astronomical indications alongside traditional timekeeping and calendar functions. This timepiece features a case crafted from precious metal, housing a manually wound movement. The watch is equipped with a sapphire crystal on both the front and reverse sides, allowing for observation of the intricate dials and the movement. Its substantial case dimensions accommodate the complex caliber, which includes a minute repeater and a tourbillon, alongside multiple calendar and astronomical displays. As a grand complication, the reference 5002 appeals to collectors seeking Patek Philippe's highest level of mechanical artistry. Its dual-dial presentation and extensive complication set, including a perpetual calendar with retrograde date, sidereal time, and a sky chart, position it as a significant piece for those focused on technical achievement and the brand's heritage in complex watchmaking. The limited production and intricate nature contribute to its collector relevance.