The ROLEX Ref 3525, circa 1941 – one of the earliest Oyster-cased chronographs by the firm. Hans Wilsdorf, founder of both ROLEX and Tudor Watch, offered this particular model to English officers who were sent to POW camps during WWII, whose wristwatches were confiscated. If soldiers sent a letter explaining their situation, Wilsdorf would defer payment until after the war.