The Oyster Perpetual is the heart of the Rolex brand. One of the company's earliest creations, the Oyster Perpetual brings together two incredibly important technologies and laid the groundwork for all of the historic and modern Rolex watches. In all models, the watches just have three hands: hours, minutes and center seconds. It's wound using the Twinlock screw-down crown, is paired with the Oyster bracelet and Oysterclasp fastener, and has Chromalight for lume. This is what makes the Oyster Perpetual so wearable. The are more than 30 iterations of the Oyster Perpetual, with varying colors, bezels, and sizes. Until recently, it was available in 26-31-34 and 36 mm sizes. This made the Oyster Perpetual a vintage sized watch until 2015, when they launched a 39 mm size and then the 41 mm in 2020.