Doxa

Professional

Reference Number :

840.10.351.21

Series : SUB 300T

Retail: $1,950

(As of: 05/2025)

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

Quick TakeAlright, strap in because the DOXA SUB 300T Professional isn't just telling time, it's telling a story of deep-sea adventure, straight outta 1968 but built for today's challenges. Forget subtle – that iconic orange dial screams "look at me, I dive deep!" This isn't some desk diver playing dress-up; it's the real deal, a descendant of the Conquistador, the watch that brought the helium escape valve to the masses. With 1200 meters of water resistance, it practically dares the ocean depths to test its mettle. That chunky 42.5mm steel case feels purposeful, substantial. The sapphire crystal shrugs off scratches, while the anti-reflective coat keeps things clear whether you're checking your dive time or just the time for lunch. And that bezel? Pure DOXA genius – the no-deco scale isn't just functional, it's a badge of honor for those who understand its purpose. Ticking inside is a reliable Swiss automatic heart, keeping perfect time while you focus on your ascent. Whether on the classic "Beads of Rice" bracelet or the tough FKM rubber, the ratcheting clasp ensures a perfect fit over a wetsuit. It’s a serious tool with serious heritage, but man, does it look cool doing it.

DescriptionManufacturing specifications dictate the SUB 300T Professional case utilize high-grade 316L stainless steel, ensuring structural integrity and corrosion resistance suitable for marine environments. Overall case dimensions measure 42.50 mm by 44.50 mm, with a total height profile of 13.65 mm. Protection for the dial is afforded by a scratch-resistant sapphire crystal, which receives an anti-reflective coating to maximize legibility by minimizing glare under various lighting conditions. Water ingress protection is engineered to a significant depth rating of 1,200 meters (equivalent to 120 ATM or 3,937 feet), achieved through robust construction techniques including a screw-down crown mechanism and a solid stainless steel screw-down case back. These elements work in concert to maintain a hermetic seal against extreme pressures encountered during deep diving activities.

Further enhancing its deep-diving credentials, the watch incorporates an integrated helium release valve (HRV), a critical component for saturation diving, allowing trapped helium molecules to escape safely during decompression. The timing apparatus features a patented unidirectional rotating bezel, calibrated in feet, which includes an integrated no-decompression dive time calculator, a signature Doxa feature providing essential dive safety information. The movement housed within is a Swiss mechanical automatic caliber, operating on a self-winding principle. It possesses a power reserve of approximately 38 hours when fully wound and oscillates at a frequency of 28,800 vibrations per hour (4.0 Hz), ensuring reliable timekeeping. This movement, decorated by DOXA, drives the central hour, minute, and second hands, alongside a date indication. Legibility in low-light underwater conditions is paramount, addressed through the application of Super-LumiNova® luminescent material to all critical dive-relevant indicators on the dial and bezel. Attachment to the wrist is facilitated by either a 316L stainless steel "Beads of Rice" bracelet or an FKM rubber strap, both options secured with a folding clasp incorporating a practical ratcheting wetsuit extension system. The lug width is standardized at 20.00 mm.

GenderMen

SignaturesDOXA

Country of OriginSwitzerland

Case Size42.5 mm

MovementAutomatic

FunctionsHours, Minutes, Seconds, Date

Power Reserve38 Hours

Case MaterialsStainless Steel

Bezel MaterialsStainless Steel

Lug MaterialsStainless Steel

Case BackSolid

CrownScrew Down