The terms "Oyster" and "Perpetual" are special to Rolex; as you get more familiar with the brand you'll immediately find how often these two words come up. Somewhat confusingly, many Rolex watches, such as the Submariner, Datejust, and Daytona, all fall under the "Oyster Perpetual" lineup but there is also a specific Rolex model called the Oyster Perpetual. If you've ever thought about what the difference is between the replica Rolex Oyster Perpetual watch vs. Oyster Perpetual range, read on to find out. In 1926, Rolex unveiled the Oyster, which was the world's first truly waterproof and dust-proof wristwatch. The Oyster's particular case architecture comprised of a screw-down winding crown, a screw-down fluted bezel, and a screw-down fluted caseback to hermetically seal the watch. Several years later, in 1931, Rolex introduced yet another groundbreaking innovation in the form of the Perpetual movement. This was the world's first automatic movement that used a Perpetual rotor - a semi-circular shaped oscillating weight that moves in either direction according to the motion of the wearer's wrist - to wind up the mainspring that powers the watch. Nowadays, if a Rolex watch has the words "Oyster Perpetual" on the dial, it means that the watch has an Oyster case with a screw-down caseback, which offers a minimum water-resistance rating of 100 meters, and that it is automatic-winding because of its Perpetual movement. Take a closer view at the dials of any GMT-Master, Milgauss, Explorer, Datejust, or Day-Date, and you'll see that they are all marked with "Oyster Perpetual" on their dials. So, these all belong to the Oyster Perpetual range. On the other hand, the Rolex Oyster Perpetual watch is the brand's entry-level model with a straightforward time-only dial. Current-production versions are exclusively made in stainless steel and there are some size options to choose from such as 39mm, 36mm, 34mm, 31mm, and 26mm. Apart from the case sizes, there are also plenty of dial color options available on the Rolex Oyster Perpetual. But, other details, such as steel Oyster bracelets, smooth bezels, and straight baton hands remain the same across all Oyster Perpetual models. Surely, like all fake Rolex watches within the Oyster Perpetual range, the OP watches are also water-resistant and powered by automatic movements. The Oyster Perpetual watch is the purest expression of Rolex's core design features, and serves as the foundation for most of Rolex's various other watch collections. Most of the current Rolex models are part of the Oyster Perpetual range, which emphasizes that the Rolex is not only luxurious, but also sturdy and practical.