Rolex 'Oyster Perpetual' wristwatch, 1931.

Rolex 'Oyster Perpetual' wristwatch, 1931.
This is an example of the first really practical and long lasting self-winding wristwatch which was introduced by Rolex in 1931. A small movement of the wrist causes a semicircular weight to rotate and wind the mainspring. This keeps the spring at optimum tension, thereby ensuring greater accuracy and reliability. As its name implies, the case of this watch is water-resistant, a feature that Rolex introduced in 1926.
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