In  a span of 5 years from 1926 to 1931, Rolex and Hans Wilsdorf would  create and patent two major horology milestones, which would forever set  Rolex apart; the Rolex Oyster waterproof watch-case, and the Rolex Perpetual Movement. In 1925, Rolex would also create and  register their famous trademark logo of the Rolex five-point logo crown.
The  Art-Deco era was a time of tremendous growth for Rolex, so much so,  there are many art-deco elements which remain today as part of their  current design language.
The  Rolex Oyster is perhaps the most revolutionary and profound development  in watch history. The following patent application was filed by Hans  Wilsdorf on behalf of Rolex in 1926:

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