The Synchron Ti300M Poseidon Deep Black is an annual edition of Synchron’s flagship titanium dive watch: the same Grade 5 titanium 41mm case and Swiss Sellita SW200-1 movement as the yellow-dial Ti300M Poseidon, now finished with a matte black dial and 3D-BRYTE technology indices — 3D luminous pieces cut in the shape of each index, fixed to the dial with two pins each — for extreme night-time luminosity.
The Ti300M Poseidon takes its name from its defining specifications: a titanium case paired with 300-meter water resistance. Homage to the great dive watches of the 1970s, updated with modern materials and Swiss engineering. At 41mm diameter, 11.9mm thin, and just 50 grams on the head, it balances professional dive-watch proportions with the wearability of a titanium daily watch.
The Deep Black is limited to 300 pieces per year, first batch ships October 2026, second batch ships January 2027, and is offered at $1,490 pre-order (regular $1,690). A $500 deposit option is available at checkout.
The hour indices are not printed and not applied lume plots. They are 3D-BRYTE technology indices — three-dimensional luminous pieces, cut in the shape of each index and fixed to the dial with two pins each for permanent alignment.
The extra luminous mass makes them read brighter in the dark, and the sculpted-piece construction makes them read as distinct objects on the dial in daylight — almost like small ceramic tiles pinned to a matte black plane.
Drag the slider on the left to see the 3D-BRYTE glow.
The new Synchron Titanium. Built with Poseidon. Built to dive.
Ten years ago, Synchron and Poseidon began working together — two houses with deep roots in their own fields, brought together by a shared conviction: the diver comes first. A decade on, that partnership has shaped a tool watch tested where it matters, in the water.
The new Synchron Titanium is the lightest expression of that philosophy yet. 50 grams. 11.9 mm thin. Light on the wrist, easy under a wetsuit, comfortable from the first dive of the day to the last. Grade titanium delivers the toughness of a professional instrument with a wearability few dive watches can match.
Both brands carry rich histories of their own. Poseidon helped define modern diving equipment. Synchron, from the golden age of dive watchmaking, shaped the tools the industry was built on — including the legendary TROPIC® strap. The new Titanium channels that combined heritage into something modern, light, and unmistakably purposeful.
Professional specs. Honest price. No theatre.
Synchron Titanium — built to dive.
The Synchron Ti300M POSEIDON is 41mm in diameter, 45mm lug-to-lug and 11.9mm thick, while the dial and bezel diameter are the same as the Synchron Military, giving it comfortable proportions that feel right without being oversized. It’s made from Grade 5 titanium, which is noticeably lighter than steel and more comfortable for daily wear. The 300-meter water resistance and screw-down crown make it capable as a proper tool watch.
At the heart of the Deep Black beats a Swiss-made Sellita SW200-1 — the industry workhorse behind hundreds of respected Swiss dive watches. We deliberately moved on from the La Joux-Perret G100: its heavier tungsten rotor produces an audible winding sound that titanium, being a light and resonant metal, tends to amplify rather than dampen. The SW200-1 winds quietly, has proven itself across millions of watches worldwide, and can be serviced for decades to come by any competent watchmaker — parts are stocked everywhere. Less noise on the wrist. Simpler service down the line. Built to run..
At exactly 50 grams and just 11.9mm thin, the Ti300M Poseidon Deep Black is a watch you constantly catch yourself admiring. The matte black dial with 3D-BRYTE technology indices stand proud of the surface like small sculpted tiles pinned to the dial — brilliant in the dark and reading as tactile jewelry in daylight. The 41mm case sits flat thanks to a short 45mm lug-to-lug and a slim profile that slides effortlessly under any cuff, dress shirt or wetsuit alike. Grade 5 titanium warms to body temperature almost instantly and never feels cold or top-heavy the way a steel diver can after a long day. Paired with the supple Genuine Tropic® strap, the result is a watch you want to look at, and one so comfortable you can wear it from a morning dive to a dinner reservation without ever wanting to take it off.
Synchron Ti300M Poseidon | Deep Black
Poseidon:
Founded in Sweden in 1958, Poseidon has spent more than six decades at the forefront of diving equipment. From the first single-hose regulator to advanced rebreathers used by professional and military divers around the world, the brand has built its reputation on engineering that performs when conditions are at their hardest. Poseidon doesn’t follow the diving industry — it has helped define it.
Synchron:
The Synchron name has a storied place in Swiss watchmaking. From 1968 to 1980, Synchron was a Swiss holding company that brought together three historic houses — Cyma, Doxa, and Ernest Borel — uniting some of the most respected names of the era under a single roof in Le Locle. After the quartz crisis dispersed the original group, the Synchron name was reborn decades later with the same spirit: to preserve and revive the great heritage brands of Swiss diving and watchmaking. Today’s Synchron is the steward of legendary names including Synchron, Aquadive, TROPIC®, and ISOfrane — and the maker of its own focused collection of purposeful dive watches
