To commemorate the 50th anniversary of the Sea-Dweller, Rolex introduced the new Sea-Dweller ref. 126600 at Baselworld 2017. Regarded as one of the most important models launched by Rolex, the Sea-Dweller is arguably the least commercial model in the lineup as it is a highly professional tool watch initially developed in collaboration with COMEX. The first model launched was the ref. 1665 in 1967 and it was Rolex’s most capable diver’s wristwatch with a depth rating of up to 610 meters, which was roughly double the depth rating of a Submariner ref. 5513.