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Expanding upon the core concept of the original REEF diver, the FORMEX REEF GMT allows to track three different time zones, without sacrificing any of the REEF’s robust build quality or patented interchangeable bezel and bracelet systems. The 42mm stainless steel watch is powered by a self-winding COSC-certified SW330-2 GMT movement that comes in Sellita’s highest quality grade, using top of the line components only found in Chronometer-grade movements. The movement is visible through a sapphire crystal display case back and is beautifully decorated, automatically charging with a custom made skeleton rotor. The thin high-precision caliber allowed to construct the REEF at just 11.4mm thickness and a perceived height of 9.4mm, making it a great fit for travel, adventure and the elegant occasion alike. For any underwater activities, a double gasket construction and screw-down crown are designed and tested for 300 m / 1000 ft of water resistance.

Being one of the most exposed parts, the bidirectional rotatable GMT bezels with a unique sunburst finish are made of an extremely hard and scratch-resistant Zirconium oxide ceramic and one stainless steel option. The bezels with white numerals on the scale are filled with Swiss Super-LumiNova® BGW9 and glow in the dark. The 48-click action is smooth and offers to accurately track a third timezone. This bezel can be changed without the use of any tools.

The sunray finished dial is manufactured at Formex’s in-house dial manufacture in the Jura mountains. The gradient for the different colors is sprayed by hand. The REEF’s bold rehaut-style hour markers are also hand-applied and triangle shaped, pointing towards the broad hour and minute hands that share the same detailed beveled mirror polish and brushed top surface finishing. Hands and hour markers are deep-filled with Swiss Super-LumiNova® BGW9 that emits a long-lasting blue glow in dark conditions.

The Solid-link stainless steel bracelet, the Mesh stainless steel bracelet, the leather and rubber strap all feature a buckle with a patented fine-adjustment system as well as a completely re-engineered and patented quick release system that allows to swap straps without the use of any tools.


Swiss Made Automatic Movement
Bidirectional Rotating Bezel
Screw-Down Crown
Sapphire Crystal
Anti-Reflective (AR) Coating
Water Resistance 30 Bar
Patented Micro-Adjustment System

Tool-Free Change of Straps/Bracelet

     3-Year Guarantee

     Swiss Made



Swiss Made Sellita SW330-2 (self-winding) Automatic (Chronometer grade) with 2nd time zone / 24h GMT in center, date and GMT with quick setting, glucydur balance wheel, fully decorated with custom-built skeleton rotor with thermally blued screws. 25 jewels. Officially certified by COSC. Automatic winding in both directions. 56 hours power reserve.


Diameter: 42mm
Height: 11.4mm (perceived 9.4mm)
Lug width: 22mm
Lug-to-lug: 47mm
Water resistance: 30 bar (300 metres / 1000 feet)
Weight: 90g (case only)


Bezel: Bidirectional Rotating and Removable bezel made of Zirconium Oxide Ceramic bezel (blue, black, green) / Stainless steel for the steel bezel. Bezels with white numerals are filled with Swiss Super-LumiNova® BGW9
Case: Stainless steel 316L
Glass: Sapphire crystal with anti-reflection treatment


Leather and rubber straps with Quick Release function and carbon fiber composite deployant clasp with patented Micro-Adjustment System. Stainless steel solid-link bracelet and Stainless steel Mesh bracelet with screwed links, Quick Release function and stainless steel buckle with patented Micro-Adjustment System


Multi-finished & hand-applied Dégradé. BGW9 Super-LumiNova on hands and indexes.


Your rubber strap comes on our new deployant clasp with a patented fine-adjustment. More intuitive to operate, the new version is fully made out of our proprietary carbon fiber composite. The micro-adjustment is now even easier to use and can be operated while the watch is on your wrist. Lightweight, smooth to the touch, ultra-durable and highly functional, this clasp is a real piece of engineering, making your REEF even more comfortable to wear.