The DOXA SUB 300T is a legendary name in the world of dive watches, tracing its origins back to the mid-1960s when DOXA sought to create the ideal, purpose-built tool for the growing sport of scuba diving. Launched shortly after the original SUB 300, the 300T built upon its success, solidifying features that became brand hallmarks. These include the distinctive cushion-shaped case for comfortable wear, and crucially, the patented rotating bezel engraved with the US Navy's no-decompression dive limits. This innovation allowed divers to easily calculate safe dive times directly on their wrist. Often presented with highly legible, vibrant dial colors – particularly the famous professional orange – the SUB 300T was designed for optimal underwater visibility and became a favorite of pioneers like Jacques Cousteau and his Calypso crew, further cementing its iconic status.
DOXA itself was founded in 1889 by Georges Ducommun in the Swiss Jura mountains, initially building a reputation for quality pocket watches and innovative 8-day dashboard clocks used in early automobiles and aircraft. Shifting focus towards wristwatches, the company made its most significant mark on horology with the development of the SUB dive watch series in the 1960s. This strategic move positioned DOXA as a specialist in robust, professional-grade underwater timepieces. The brand's commitment to functionality, reliability, and unique design, particularly with the SUB 300 and SUB 300T, earned it a dedicated following among professional divers, military units, and watch enthusiasts that continues to this day, with the company remaining an independent Swiss watchmaker focused on its rich diving heritage.