Tudor is a Swiss manufacturer of high-quality wristwatches based in Geneva. Registered in 1926 at the request of Hans Wilsdorf, the founder of Rolex SA, it was positioned as a more affordable alternative. Today the brand remains a sister company to the parent company, both of which are owned by the Hans Wilsdorf Foundation. Tudor watches are especially well known for their professional watches for divers and the military. Between the 1960s and 1980s several navies issued Tudor Submariners to their divers, including the US Navy to its elite SEALs, and the French to their famous Marine Nationale (French Navy).