Fortis

M-40 Rockstone Gray

Reference Number :

F8120006

Series : Marinemaster

Retail: $3,200

(As of: 03/2025)

This watch is not for sale, this page is just for reference purposes only. If you would like to purchase this watch, please contact Fortis. If you are interested in selling this watch to us, you can contact us here.

Quick TakeThe Marinemaster M-40 Rockstone Gray isn't just a tool; it's an extension of a seasoned explorer's wrist. The 40mm recycled stainless steel case feels confidently present without being overbearing, ready for any saltwater plunge with its formidable 300m water resistance. The Gear Bezel® clicks with satisfying precision, a tactile reminder of its focused engineering. The rockstone grey dial under that anti-reflective sapphire crystal, shows pure instrument-inspired clarity. Its Superluminova® X1 indices, a subtle nod to after-dark missions, add a blue glow to the watch. Underneath it all ticks the UW-30 automatic caliber, the reliable heart of this underwater-ready, adventure-ready timepiece, offering solid performance. The screw-down crown and triple-gasket system add to the overall ruggedness of this expertly made timepiece. The M-40 Rockstone Gray is for those who respect a watch that is expertly built for its intended purpose.

DescriptionThe Fortis Marinemaster M-40, reference F8120006, is meticulously constructed with a focus on durability and functionality. The case, measuring 40mm in diameter and fabricated from recycled stainless steel, features a lug-to-lug measurement of 43mm and a height of 12mm. The substantial construction translates to a watch head weight of 76 grams. Water resistance is a paramount feature, engineered to withstand pressures up to 300 meters (1000 feet, 30 atmospheres). This impressive seal is achieved through a combination of design elements, including a screw-down crown equipped with a triple gasket system and high-performance FKM gaskets throughout the case assembly. The unidirectional Gear Bezel®, a distinctive element of the Marinemaster line, facilitates precise timing. The watch features an ultra-engraved stainless steel case back, which further contributes to its overall robustness.

Protecting the dial is a sapphire crystal, chosen for its exceptional scratch resistance. This crystal is further enhanced with an anti-reflective coating applied to both sides, ensuring legibility under a wide range of lighting conditions. The Rockstone Gray dial itself presents a textured Fortis "O" pattern, providing a subtle, yet distinctive backdrop. Applied indices, filled with Superluminova®X1, ensure visibility in low-light environments, emitting a blue glow. The hour and minute hands are crafted from metal and also incorporate Superluminova®X1, while the sweep second hand is distinguished by a "Bull's Eye" indicator, also treated with Superluminova®X1. Powering the Marinemaster M-40 is the automatic Performance Calibre UW-30. This chronometer-regulated movement features a date complication, and its power reserve measures approximately 38 hours when fully wound. The movement is fully encased with its high water resistence and high performance gaskets.

GenderMen

SignaturesFortis

Country of OriginSwitzerland

Case Size40 mm

MovementAutomatic

CaliberUW-30

FunctionsHours, Minutes, Seconds, Date

Power Reserve38 Hours

Case MaterialsStainless Steel

Bezel MaterialsStainless Steel

Lug MaterialsStainless Steel

Case BackSolid