Rolex 16600 (Pre-owned - Good) — USD 9,199 on eBay

The Sea-Dweller reference 16600 represents a significant evolution within Rolex's professional dive watch collection, succeeding the reference 16660. It maintained the robust engineering principles of its predecessors while incorporating updated materials and manufacturing techniques. This reference is distinguished by its helium escape valve, a feature essential for saturation divers, allowing trapped gases to escape during decompression without damaging the crystal. It is a tool watch designed for extreme underwater environments, positioned above the Submariner in terms of water resistance and specialized features. This reference features a 40 mm stainless steel case, providing a substantial yet wearable presence. It is equipped with the self-winding caliber 3135, a chronometer-certified movement known for its reliability and precision, offering a power reserve of approximately 48 hours. The watch utilizes a sapphire crystal, contributing to its enhanced durability and scratch resistance. Its construction ensures a water resistance rating suitable for professional diving applications. For collectors, the 16600 is notable as the last Sea-Dweller reference to feature a 40mm case and an aluminum bezel insert before the introduction of ceramic bezels and larger case sizes. It appeals to enthusiasts seeking a modern classic with traditional proportions and a robust, purpose-built design. The consistent black dial and steel bracelet across its production run underscore its functional aesthetic.