IWC GST (Pre-owned - Good) — USD 5,430 on eBay

The GST-DEEP-ONE represents IWC's entry in the diving watch category, featuring a black dial configuration within the Steel series. This reference combines the brand's automatic movement technology with dive-oriented functionality in a 40mm steel case format. The 40mm steel case houses an automatic movement and presents a black dial beneath sapphire crystal protection. The rotating dive bezel provides the primary tool functionality, while 200-meter water resistance supports the diving capability. The steel case material provides durability for the intended aquatic applications. This reference appeals to collectors seeking a mid-sized diving watch from IWC's catalog. The 40mm case diameter positions it as accessible to various wrist sizes, while the black dial and steel construction offer versatility for both tool watch enthusiasts and those preferring understated aesthetics. The automatic movement eliminates manual winding requirements for regular wear.