DOXA SUB 300 Carbon COSC
Aquamarine

In 1967, DOXA launched the revolutionary SUB concept with the SUB 300, the first truly purpose-designed diver's tool-watch that was also accessible to the general public. The radical innovations it introduced quickly made it the benchmark for professionals, too. Rated to 30 ATM, i.e. water resistant to a depth of 300 meters or about 980 feet, it was the first to feature a unidirectional bezel with a dual indication of dive time and depth. Linking the two enabled divers to calculate and monitor dive duration to ensure a safe ascent without decompression stops.

At the time, the US Navy no-decompression dive table was the most authoritative system, allowing divers to monitor their underwater time as a function of depth to ensure a safe return to the surface. DOXA engineers took the US Navy’s findings and incorporated two separate scales into the bezel, one orange on the outer ‘depth’ ring and the other black on the inner ‘minutes’ ring – it became a DOXA patent.

The SUB 300 also became instantly recognizable – and legendary – for another reason: it was the first diver’s watch ever to sport a bright orange dial, contrasting with the traditional black or white dials so common on other diving watches of the time.