What Does 'Oyster Perpetual' Mean?

.Rolex Shopping Guide.
The words 'Oyster Perpetual' appear in the names of most Rolex wristwatch models. While most people only use the particular model name when referring to one of these timepieces, Daytona or Submariner for example, there is a reason the watchmaker includes these words as well. 

Photo of Rolex Oyster Case
Rolex Oyster Case (photo: Rolex)
The word 'Oyster' refers to the Oyster case that was developed and patented by Rolex in 1926. Shown in the photo above, this case creates a hermetic seal that gives all models that use this case a depth rating of 100 meters. The only model that does not use the Oyster case is the Cellini. For this reason, the 'Oyster Perpetual' is omitted when referring to Cellini models.

'Perpetual' refers to the Perpetual rotor of the movement housed inside the Oyster case. Patented by Rolex in 1931, the Perpetual rotor created a self-winding movement that was powered by a half-moon shaped oscillating weight that would rotate 360º with the natural movement of the wearer's wrist to generate power.

Photo of Rolex Perpetual Rotor
Rolex Perpetual Rotor (photo: Rolex)
These innovations created the first waterproof and automatic mechanical wristwatches on the market and while the patent on the Perpetual rotor expired in 1948, it still represents an important legacy that the watchmaker chooses to honor in the names of their current wristwatch models.

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Rolex Perpetual Rotor

.Tech.
Anyone who has done research on Rolex models online has probably wondered why the words 'Oyster Perpetual' appear at the beginning of most model names. The company holds many patents on their technologies and while the patent on their Perpetual rotor expired in 1948, it still represents a technological advancement that made history in the watchmaking industry. 

Photo of Rolex Perpetual Rotor
Rolex Perpetual Rotor
The first perpetual rotor with an oscillating weight was created for pocket watches in the late 18th century. It employed slightly different technology than the perpetual rotor patented by Rolex in 1931, just a few years after they patented their hermetically sealed Oyster case.

Rolex's Perpetual rotor, which became the industry standard after their patent expired, works by capturing the energy caused by the 360º movement of the half-moon shaped oscillating weight and transmitting it to the mainspring. There is a clutch system that prevents the rotor from overwinding and conserves the energy in the watch for up to two or three days, depending on the power reserve of the watch.

The Perpetual rotor uses kinetic energy created by wrist motion and gravity to power the movement, a departure from previous technology that required the wearer to wind the crown manually to power the wristwatch.

In the age of the smartphone - and smartwatch - it is easy to understand why a self-winding wristwatch is more desirable than a watch you have to wind yourself. Rolex's Perpetual rotor is an innovation that has provided convenience and ease to the wristwatch wearers for almost 100 years.

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