montres tudor sa is a swiss manufacturer of wristwatches based in geneva. registered in 1926 at the request of hans wilsdorf, the founder of rolex sa, the brand remains a sister company to rolex, both companies being owned by the hans wilsdorf foundation. over time tudor became especially well known for its tool watches, producing watches for professional divers and the military. between the 1960s and 1980s several navies issued tudor submariners to their divers, including the us navy seals, and the french marine nationale (french navy).