FORTIS – MARINEMASTER M-44 DLC Black Resin and Gravity Black

FORTIS – MARINEMASTER  M-44 DLC Black Resin and Gravity Black Chronometer - 2026

  HARD. HARDER. MARINEMASTER DLC.

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The Marinemaster M-44 DLC marks the first time Fortis equips its oldest collection with a full Dianoir® Diamond-Like Carbon coating. 

 

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Reaching around 4’500 Vickers, the surface is roughly twenty times harder than conventional stainless steel, enhancing resistance against abrasion, saltwater and impact. Combined with 500 metre water resistance, the 

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Fortis Lock System and the Kenissi-built Werk 11 manufacture movement, the new Gravity Black and Black Resin models continue the Marinemaster’s legacy as a professional dive instrument engineered for extreme environments.

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Pressure reveals character. The new Marinemaster M-44 DLC brings the first full Dianoir® Diamond-Like Carbon coating to Fortis’ oldest collection. A surface engineered for abrasion, salt, impact and time. 

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At around 4’500 Vickers, the case reaches a hardness roughly twenty times higher than conventional stainless steel. 

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The result is a Marinemaster that pushes durability to a new level while keeping the clarity and reliability the collection stands for.

The First Marinemaster in DLC

Since 1954 the Marinemaster has been Fortis’ dedicated dive instrument. 

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Decades of real use have shaped its direction. The M-44 DLC continues that story with a material that strengthens the watch where it matters most.

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Dianoir® Diamond-Like Carbon forms an extremely dense carbon layer that protects the case from scratches, abrasion and corrosion. Equipment contact, saltwater, sand and pressure are part of the environment this watch was made for. 

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The DLC coating ensures the Marinemaster keeps its composure in exactly those conditions.

Built for Depth

The Marinemaster M-44 DLC remains a professional dive watch.

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The 44 mm case is engineered for water resistance to 500 meters. The screw-down crown uses a triple gasket construction, while high-performance FKM seals support long-term reliability in demanding environments.

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A defining feature of the Marinemaster is the bi-directional Gear Bezel combined with the Fortis Lock System. 

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This mechanical locking mechanism allows the bezel to be secured in place, preventing accidental movement and ensuring reliable timing during a dive. 

Werk 11 Manufacture Movement

Inside the Marinemaster M-44 DLC operates the Fortis Werk 11. The result is a movement built to support the Marinemaster’s role as a serious instrument for demanding environments.

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The automatic manufacture calibre was developed together with Kenissi and focuses on strength, reliability and long service intervals.

WHAT IS VARIABLE INERTIA REGULATION?

In a mechanical watch, everything revolves around balance. At the heart of every movement is the balance wheel, oscillating continuously. It sets the rhythm and determines accuracy and reliability.

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Traditionally, the rate of this oscil-lation was adjusted by shortening or lengthening the hairspring. Ex-ternal shocks, however, can disturb this delicate setup and negatively affect timekeeping. This is why Fortis manufacture calibres Werk 7, Werk 11, and Werk 13 rely on vari-able inertia regulation. 

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Here, the oscillation frequency is no longer adjusted via the hair-spring, but through microscopic screws or weights positioned on the rim of the balance wheel.

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By altering the moment of inertia, regulation becomes more stable, comparable to a figure skater who spins faster when pulling their arms inward. The result is a regulation system that is more stable, more shock-resistant and more precise, maintaining accuracy even under extreme conditions.

The gold standard of modern watchmaking

Today, this principle is widely regarded as the gold standard of haute horlogerie. It is no coincidence that manufacturers such as Patek Philippe, Rolex and other top-tier brands rely on this form of regulation. It stands for maximum precision, exceptional robustness and genuine watchmaking sub-stance. 

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The movement delivers a 70 hour power reserve and uses a variable inertia balance for stable precision. Its construction emphasises durability and resistance to shocks. 

Readability When It Matters

Legibility remains one of the core priorities of the Marinemaster. Large applied indices and hands are filled with Superluminova® X1 for strong visibility in darkness and underwater conditions.

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The Gravity Black version focuses on a technical monochrome aesthetic while the Black Resin introduces warm golden accents across the dial. 

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Light catches these details like reflections on moving water, giving the watch a distinctive character without compromising readability. 

 The Next Chapter of the Marinemaster

The Marinemaster M-44 DLC carries forward more than seventy years of dive watch development at Fortis. The addition of the Dianoir® Diamond-Like Carbon coating strengthens the collection with a surface designed for extreme wear resistance.

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Combined with 500 metre water resistance, the Fortis Lock System and the Kenissi built Werk 11 manufacture movement, the Marinemaster M-44 DLC represents a new generation of Fortis dive instruments.

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THE SURFACE IS LOUD. THE DEPTH IS HONEST.

Those who dive with the Ocean Collective enter a mindset: re-spectful, conscious, connected. Ocean Collective is a passionate community of marine biologists, freedivers, photographers, and people united by one thing: a deep connection to the ocean. They do not want to admire it alone. They want to understand it. And protect it.

Between science and experience:

What defines the Ocean Collective is their approach: bringing people to the point where research be-comes tangible. Participants ac-company scientific projects, dive with sharks, observe whales, map coral reefs and document endangered species. 

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These are far away from typical tourist trips. They are expeditions with purpose. With every journey, Ocean Collective directly supports marine conser-vation: through data collection, education and financial contribu-tions to local initiatives. Adventure becomes responsibility. Curiosity becomes understanding.

Freediving as awareness:

Freediving stands at the centre of many projects. No compressed air. No separation between human and ocean. It is the quietest form of connection, with nature and with oneself. Anyone who encounters a whale shark in complete stillness understands immediately: We are just guests in this world.

Community over hierarchy: “Collective” is a lived philosophy here. Anyone can become part of it: as a researcher, a photographer or simply as someone who cares deeply about the ocean. It is about contribution and awareness rather than titles and ego.

 

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One goal: preserve what remains 

At a time when coral reefs are dy-ing, plastic mountains are growing and oceans are being exploited, initiatives like Ocean Collective are essential. As a link between sci-ence and experience. Between re-sponsibility and emotion.

Fortis & Ocean Collective: a shared mindset

What the Ocean Collective lives underwater, Fortis lives on land: awareness, durability and responsibility. This partnership is a shared statement for action that is real. We both share the conviction that true strength is not loud but sus-tainable.

For the Ocean Collective team the Marinemaster is both a trusted companion and a reliable tool, be-low the surface and above sea lev-el. (picture above, from left to right: Anna Renner, Lennart Vossgätter, Emmi Renner and Lukas Müller) 

 

You can test watches in a laboratory...... OR IN REAL LIFE.

Ocean Collective is a partner in mindset. And a test partner in the very element the Marinemaster is built for: the ocean. Where pres-sure, salt, cold, and darkness are not exceptions, but every day conditions.

 

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Members of the Ocean Collective spend weeks and months operating in the harshest environments. Freediving. Expeditions. Scientific fieldwork. Our watches are with them. Day in, day out. Put to the test. No show. No studio. No sim-ulation.

From theory to practice:

This partnership matters because feedback from Ocean Collective flows directly into development. Real experience. Real data. Real insight. Including the understanding that a helium escape valve is unnecessary, while a lockable, bidirectional bezel is essential. 

 

Learn freediving. Or join and expedition.

You don’t need to be a professional to experience depth. Just willing to immerse yourself in water, in silence, in yourself.

Ocean Collective offers freediving courses and expeditions that go beyond discovery. They actively protect the ocean. Dive along-side scientists, photographers and ocean enthusiasts. Observe sharks. Explore coral reefs. Help document endangered species.

 

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Without noise and engines. Just you, your breath and the ocean. And as you go deeper, let the awareness grow. The awareness for yourself and for the ocean that connects us all. So choose a break that lasts. Some-thing real. Something with impact. Learn freediving. Or join an expedition with Ocean Collective.

More information and bookings at www.ocean-collective.de 

 

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The new Fortis Marinemaster M-44 DLC, available in either the Black Resin (ref. F8120031) or Gravity Black (ref. F8120030), is priced at €4,950.00 / $5,450.00 / CHF 4,550. (incl. taxes)

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Technical Specifications

Collection:   MARINEMASTER

Model  Marinemaster M-44 DLC Gravity Black and Black Resin

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• Reference F8120031 (Black Resin) 
• Reference F8120030 (Gravity Black)

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Case
Diameter 44 mm
Lug To Lug 48 mm
Height 14 mm
Material 

• Recycled Stainless Steel with DLC Dianoir® Coating
• DLC Dianoir® and regular Stainless Steel

Water Resistance 500m /·1640ft · 50atm
Bezel Type Bidirectional Gear Bezel with Fortis Lock System
Weight Watchhead 102 gr
Crown Screw-Down Crown with Triple Gasket System
Gaskets Performance FKM Gaskets
Crystal Sapphire Crystal with Anti-Reflective Coating on both Sides
Case Back 

• DLC Dianoir® with Ultra-Engraving 
• Case Back Stainless Steel with Ultra-Engraving

Dial

• Black dial with Fortis O-pattern with applied golden Superluminova®X1 Markers
• Black dial with Fortis O-pattern with applied Superluminova®X1 Markers

Luminescence Superluminova®X1 with blue glow
Sweep Second Hand 

• Metallic Golden with Superluminova®X1 Bull's Eye 
• Metallic Hour Hand with Superluminova®X1. Orange Minute Hand with Superluminova®X1

Movement
Automatic Manufacture Calibre Werk 11
 Complication Date
Power Reserve 70H
Regulation Certified Chronometer 
Strap
Type Horizon Strap
Material Hypoallergenic FKM rubber. Resistant to heat, chemicals and UV radiation, making the Horizon Strap ideal for all adventures, both on land and underwater.
Buckle Black DLC Coated Stainless Steel Pin Buckle
Mounting Screw Pin System 

 

🔴PRICE: CHF 4'550.00 / US $5,450.00 / €4,950.00 (Taxes & Duties included )💰

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Press Release - 2026
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