IWC Aquatimer (Usato - Eccellente) — USD 5,173 on eBay

The IWC Aquatimer GST reference 3536-02 is a significant model within IWC's professional diving instrument series, introduced as part of the GST (Gold, Steel, Titanium) collection. It represents a period where IWC focused on integrating advanced materials and robust engineering into its tool watches, offering a blend of functionality and understated design that appealed to serious enthusiasts and professionals alike. This particular reference features a titanium case, known for its lightweight and hypoallergenic properties, paired with a black dial. It houses an automatic mechanical movement, providing reliable timekeeping and a date complication. The watch is equipped with an internal rotating bezel, operated by a second crown, enhancing its utility as a dive watch by protecting the timing mechanism from accidental external impacts. The sapphire crystal ensures durability and legibility under various conditions. For collectors, the Aquatimer GST 3536-02 is valued for its build quality, the use of titanium, and its position as a bridge between IWC's earlier dive watches and subsequent Aquatimer generations. Its clean design and robust construction make it a sought-after piece for those who appreciate IWC's engineering philosophy and the practical aspects of a high-performance dive watch.