Reef GMT 42 mm

The Formex Reef GMT 42mm blends rugged dive capability with sophisticated travel functionality in a package that feels as refined as it is robust. Built for wearers crossing time zones and terrains alike, it brings the signature design language of the Reef collection into GMT territory—offering a bold, modern aesthetic with the technical chops to match. A bi-directional ceramic bezel, clean legible dial, and luminous accents ensure clarity wherever your journey takes you.

The case measures 42mm in diameter, 11.4mm thick, and 47mm lug-to-lug, offering a strong wrist presence without bulk. It’s made of 316L stainless steel with a brushed and polished finish and fitted with a screw-down crown and 48-click ceramic bezel that’s both tool-free swappable and lume-filled. The front crystal is sapphire with internal anti-reflective coating, and the caseback features a sapphire exhibition window. With 300 meters of water resistance and a secure, quick-adjust bracelet or strap, it’s built for serious use above and below the surface.

Powering the Reef GMT is a COSC-certified Sellita SW330-2 automatic movement, delivering chronometer-grade accuracy and a power reserve of approximately 56 hours. A fourth GMT hand allows you to track an additional time zone via the 24-hour scale on the bezel, with independent setting functionality. It’s a reliable, Swiss-made engine tailored for precision whether you're flying, diving, or commuting across continents.