DOXA Sub 300 Carbon COSC Watch Collection Review

DOXA Sub 300 Carbon COSC Watch Collection Review

Dressed in six of DOXA’s classic dial colours, fitted with COSC certified movements and bedecked in contemporary carbon, the new DOXA SUB 300 Carbon COSC watch collection reintroduces the largely unchanged design of its iconic Sub 300 model with a formidable material fresh out of water for today’s modern diver.

Since its introduction in the 1960’s, the DOXA Sub 300 has remained the archetype of a high-performance tool watch. Its release was inspired entirely by the growing needs of professional and amateur divers alike who wanted something of expert-grade but at an affordable price. The Biel-based watch manufacturer became the first to make a divers watch with an orange dial and rotating bezel with decompression times and the first to showcase a general public divers watch with a helium escape valve, a technology that DOXA pioneered at the time. Since then, the Sub 300 has become one of the most recognisable divers watches of all time with its aesthetics staying remarkably true to its roots over the years.

We saw the first real change in the DOXA Sub 300’s formula just last year, in 2020, with the release of the DOXA Sub 300 Carbon Aqua Lung U.S Divers Limited Edition. For the first time, the 1960’s design was engineered from ultra-modern carbon composite which reinforces the need for a lightweight and comfortable diving instrument. Now, the carbon material is introduced to its first non-limited edition line, the DOXA SUB 300 Carbon COSC watch collection, which with its brightly coloured dial designs, matching rubber straps and carbon-cased concept offers an interesting mix of old and new.


Measuring in at 42.5mm in width, 45mm in height and 13.4mm in thickness, the case of each DOXA Sub 300 Carbon COSC watch is of course engineered entirely out of forged carbon. The material is not only incredibly lightweight in comparison to stainless steel, weighing in at only 87 grams, but it has a really cool look to it. The uneven, matte and almost textured-looking pattern makes its way across the entirety of the cushion-shaped case and bezel until the case back where a portion of titanium takes over.

Positioned above the case is a matching forged carbon unidirectional rotating bezel which like all DOXA Sub’s before it showcases a twin depth-minute display including an outer depth ring and an inner minutes ring. Four out of the six colourways enliven the monochromatic bezel with orange highlights on the outer decompression scale while the Divingstar and Aquamarine variants match their corresponding dials with yellow or turquoise detailing. Each DOXA Sub 300 Carbon COSC watch is also equipped with a screw down crown and screw down titanium case back to ensure a decent 300 metre water resistance.


Just as we have seen in several DOXA Sub collections before, the DOXA Sub 300 Carbon COSC is available in a variety of classic coloured dials including the simple black dial named the Sharkhunter, the silver sunburst Searambler, bright yellow Divingstar, deep navy Caribbean, the fittingly named turquoise-coloured Aquamarine and the signature orange dial known as Professional.

Each colourway is protected by domed scratch resistant sapphire crystal glass treated with anti-reflective coating and adorned with the Sub 300’s familiar baton hands, crosshair accents and printed box-shaped indexes. On opposite corners, the DOXA and Sub 300 emblems sit parallel to each other. As expected, easy legibility is made a priority with the central hand and indexes coated in Superluminova and for the first time, the bright coloured dials stand out even further in contrast to the all-black forged carbon case.


Continuing to follow in the footsteps of its predecessors, DOXA powers each Sub 300 Carbon with the ETA 2824-2 automatic movement. The tried-and-tested calibre has been COSC certified and delivers central hands for hours, minutes and seconds, a date window at 3 o’clock, a power reserve of 38 hours and runs at a frequency of 28,800 vibrations per hour. The movement is also equipped with a DOXA decorated rotor which is sadly kept hidden from view behind a closed case back and protected inside a titanium container for increased magnetic resistance.


The DOXA SUB 300 Carbon COSC watch collection is available on a choice of colourful integrated rubber strap designs, some of which match the colour of the dial and others in contrasting black. The navy, orange, yellow and turquoise dials come on a choice of two straps, one in their retrospective dial colour and the other in black. The silver and black models come only on black rubber straps. Each strap is fitted with a black PVD stainless steel folding buckle adorned with the iconic DOXA fish logo and two pairs of push pieces, one to open the buckle and the other to release the wet suit extension.


No matter the colourway that attracts your attention, every DOXA SUB 300 Carbon COSC watch retails at £3,750 and is available to order now on the Jura Watches website. For more information on the collection and on other new DOXA watch releases, get in touch with the team on 01335 453454 or send us a message at

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