First released way back in 1931, the Oyster Perpetual is a Rolex watch in its purest form. It was the first waterproof, self-winding wristwatch to use the patented rotor system that has been the blueprint of almost every subsequent watch in the Rolex catalogue. That’s why you’ll notice the words OYSTER PERPETUAL emblazoned on the dial of most of today’s watches. If the Oyster Perpetual looks familiar, that’s because it should.