Pre-owned IWC Aquatimer Chronograph ref IW376806 (2022 – 2026). IWC released the first Aquatimer, the brand’s first official dive watch, in 1967 via ref. 812. The 37mm model notably had an inner rotating bezel to display dive time, not too unlike the modern IWC for sale here. Ref. IW376806 features a 44mm stainless steel case, a blue rubber strap with a convenient quick-change system, water resistance up to 300 meters, convex sapphire crystal, and a mechanical external/internal rotating bezel with a convenient SafeDive system. Inside the case beats the caliber 79320 self-winding mechanical movement with a chronograph, Côtes de Genève, and a 44-hour power reserve. The model you see here also sports a striking blue tri-compax dial topped with day and date displays. Shop IWC Aquatimer Collection