In 1926, a major step was taken with the creation of the world's first waterproof and dustproof wristwatch. This watch - named the “Oyster” - featured a hermetically sealed case which provided optimal protection for the movement.
The following year the Oyster crossed the English Channel unscathed worn by a young English swimmer, Mercedes Gleitze. The swim lasted over 10 hours and the watch remained in perfect working order at the end of it. The triumph led to the concept of the Testimonee, adventurous men and women, achievers whose exploits and daring would, in time, become so closely associated with Rolex.
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