Rolex Daytona Black Dial 116523 Mens Watch 40MMNow you would possibly speculate how and why could it be named as "Oyster" and "Perpetual". It received the identify Oyster as in 1926 the watchmaker of Rolex named Hans Wilsdorf invented and launched the first actually water-proof case.The Oyster Perpetual is on the market in a range of case sizes to