Doxa Watch SUB 600T Aquamarine Rubber 861.10.241.25. Doxa watches first came to life among the Jura hills of Switzerland. Inspired by the experiences within the watchmaking industry, Ducommun established the Doxa brand in 1889 which quickly became renowned for its innovative and unusual timepieces. Most famously known are the Doxa Sub watches which were the first watches in the world designed especially for sports diving, a timepiece that was considered a certified piece of divers equipment remains completely reliable in the water.