IWC GST

IWC's dive watch, and another line the brand has quietly wound down, so it now lives mostly on the pre-owned market. The Aquatimer's signature was a clever internal/external rotating bezel: you turn an outer ring and it drives the internal dive bezel through the case, keeping the clean looks of a fixed bezel with the safety of a diver's. Add a screw-down crown, strong lume, and quick-change straps and you had a proper, over-engineered tool diver. Depth ratings ran from the everyday Automatic up to serious deep-sea models, including conservation-themed editions. No longer a focus of the current collection, it's one to hunt down secondhand if you want an IWC built to get wet.