![](https://cdn11.bigcommerce.com/s-uok04hg6nb/product_images/uploaded_images/1-formex-reef-automatic-chronometer-cosc-300m-bezel.png)
Unidirectional rotatable Ceramic bezel
Being one of the most exposed parts, the unidirectional rotatable bezel is made of an extremely hard and scratch-resistant Zirconium oxide ceramic. The graduations and numbers are engraved by femto-laser pulsations. Each bezel takes 60 minutes of precision engraving to achieve its three-dimensional effect. Machined gear-like indentations on the bezel’s edge allow a diver the ideal grip to safely set and monitor diving time and decompression stops. The 120 click action is responsive and smooth, yet offers firm and precise function of the bezel. Besides that, the bezel can be changed without the use of any tools.
![](https://cdn11.bigcommerce.com/s-uok04hg6nb/product_images/uploaded_images/1-formex-reef-automatic-chronometer-cosc-300m-insta-7-1-.png?t=1629182055&_gl=1*348xr7*_ga*MTI2Mjg0MTI2NC4xNjI0MzM3NDUw*_ga_WS2VZYPC6G*MTYyOTE4MTIwOS45Ni4xLjE2MjkxODIwNjYuMTE.)
officially certified movement
The REEF is powered by a Swiss Made Sellita SW300-1 self-winding movement with a power reserve of 56 hours. We've chosen its highest quality grade "Chronometer" because it comes with premium components such as a Glucydur balance wheel which is exceptionally hard and stable, very resistant to deformation, non-magnetic, and non-corrosive. Another reason why we've purposely chosen this thin movement is because it allowed to construct the REEF at just 11.4mm thickness and a perceived height of 9.4mm. The movement is completely decorated and wound by Formex’s in-house developed and custom built skeletonized rotor. Each one of these movements is certified by the COSC (the official Swiss Chronometer Testing Institute) and undergoes the meticulous 15-day rate test to ensure extraordinary levels of mechanical accuracy and precision. Each certified chronometer is unique, identified by a number engraved on its movement and a certificate number issued by the COSC. While less than 3% of Swiss watch movements are officially certified, Formex further rate test them per the same criteria after assembly, to measure if there is any deviation from the certification rates.
fine adjustment clasp
Besides contributing to visual appeal, the details on the REEF also serve a purpose. For a timepiece to be a watch for all occasions, it needs to feel exceptionally comfortable on the wrist. For even more wrist comfort, Formex added their patented Carbon Fiber Composite Folding Clasp that allows for fine-adjustment of the strap length on the go, allowing for a perfect fit on the wrist in all conditions and temperatures. The strap can be changed without the use of any tools with Formex's patented quick release system. The stainless steel bracelet with screwed links has the same quick release system and also features a unique fine-adjustment system.
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meticulous attention to detail
Understated at first glance, but beneath the apparent simplicity lies exceptional craftsmanship in every respect. Take the symmetrical 42mm stainless steel case with its incredibly detailed finish on the ceramic bezel, perfectly rounded off with hand-finished mirror-polished bevels. 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 as well as a capsule on the bezel’s zero marker are deep-filled with Swiss Super-LumiNova® BGW9 that emits a long-lasting blue glow in dark conditions. Being able to read the time with absolute certainty is a matter of survival when diving.
TECHNICAL SPECIFICATION
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MOVEMENT
Swiss Made Sellita SW300-1 (self-winding) Automatic (Chronometer grade), officially certified by COSC. 25 jewels. Date display. Custom-built skeleton rotor with thermally blued screws. 56 hours power reserve.
CASE
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)MATERIAL
Bezel: Unidirectional rotating Zirconium Oxide Ceramic bezel (blue, black, green) / Stainless steel for the steel bezel
Case: Stainless steel 316L
Glass: Sapphire crystal with anti-reflection treatment -
STRAP
Black rubber strap with curved spring bars, Quick Release function and carbon fiber composite deployant clasp with patented Micro-Adjustment System. Stainless steel bracelet with screwed links, Quick Release function and stainless steel buckle with patented Micro-Adjustment System
DIAL
Multi-finished & hand-applied Dégradé. BGW9 Super-LumiNova on hands and indexes.
FINE-ADJUSTMENT DEPLOYANT CARBON CLASP
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.