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Rolex automatic movements
The first self-winding Rolex wristwatch was offered to the public in 1931, preceded to the market by Harwood which patented the design in 1923 and produced the first self-winding watch in 1928, powered by an internal mechanism that used the movement of the wearer's arm. This not only made watch-winding unnecessary, but eliminated the problem of over-winding a watch and harming its mechanism.

Quartz movements
Rolex participated in the development of the original quartz watch movements. Although Rolex has made very few quartz models for its Oyster line, the company's engineers were instrumental in design and implementation of the technology during the late 1960s and early 1970s. In 1968, Rolex collaborated with a consortium of 16 Swiss watch manufacturers to develop the Beta 21 quartz movement used in their Rolex Quartz Date 5100. Within about five years of research, design, and development, Rolex created the 'clean-slate' 5035/5055 movement that would eventually power the Rolex Oysterquartz.

Water resistant cases
Rolex watches was also the first watch company to create a wristwatch water resistant to 100 m (330 ft). Wilsdorf even had a specially made Rolex watch attached to the side of the Trieste bathyscaphe, which went to the bottom of the Mariana Trench. The watch survived and tested as having kept perfect time during its descent and ascent. This was confirmed by a telegram sent to Rolex the following day saying 'Am happy to confirm that even at 11,000 metres your rolex watch is as precise as on the surface. Best regards, Jacques Piccard'.