I’m not going to pretend I don’t have a soft spot for what Synchron does. Earlier this year I covered the Ti300M SEALAB Limited Edition and walked away super tempted. I also used to own a Synchron Poseidon Ice Diver, one of those watches I still think about from time to time. So when a sunshine yellow titanium diver from the same family lands in the inbox, the timing feels almost rude.
The Synchron Ti300M Poseidon Limited Edition is the result of a ten-year collaboration between Synchron and Poseidon, the dive equipment manufacturer. Limited to 500 pieces worldwide, it takes the familiar Synchron diver format and rebuilds it in Grade 5 titanium with a focus on weight and wearability. At 41mm, 11.9mm thick, and a compact 45mm lug-to-lug, the case dimensions are conservative by modern dive watch standards. The headline number is 50 grams total, which is remarkably light for a 300-meter dive watch with a sapphire crystal and a 120-click unidirectional bezel.
What stands out beyond the weight is the movement choice. Synchron went with the La Joux-Perret G100 in Soigné grade, adjusted in four positions. The G100 shares its dimensional footprint with the ETA 2824-2 and Miyota 9-series, but La Joux-Perret has made some upgrades of its own, including a single-piece tungsten rotor and a KIF anti-shock system. It’s a movement that doesn’t get discussed much in this price range, and seeing it in a sub-$1,000 titanium diver raises the question of what exactly you’re supposed to be paying more for elsewhere.
The dial is that sunshine yellow, paired with applied markers filled with X1 Super-LumiNova and a flat sapphire crystal with triple anti-reflective coating. The bezel insert features a non-decompression US Navy dive table, a detail that leans into Synchron’s tool watch identity rather than treating the bezel as decoration. Synchron pairs the watch with a Genuine Tropic rubber strap, which makes sense given that Synchron actually manufactures those straps.
At $990 pre-order, the Ti300M Poseidon asks less than most Swiss titanium divers while matching or exceeding several of them on paper. Titanium construction, a credible Swiss movement, 300 meters of water resistance, and a strap from a brand with a documented history in that category. The first batch of 100 pieces ships between May 17th and 31st, with a second batch following in October 2026. I’ll admit, yellow dial dive watches have a way of making my decision-making worse, and this one isn’t helping. Great work, Synchron. I’m watching.
Co-Founder & Senior Editor
Michael Peñate is an American writer, photographer, and podcaster based in Seattle, Washington. His work typically focuses on the passage of time and the tools we use to connect with that very journey. From aviation to music and travel, his interests span a multitude of disciplines that often intersect with the world of watches – and the obsessive culture behind collecting them.