Quote:
Originally Posted by padi56
The screw down crown was not a Rolex invention around 1925 Hans Wilsdorf of the RWC heard that two watchmakers one was Paul Perregaux other George Perrolet they had taken out a Swiss patent for the first twin lock screwed stem system crown.Now Hans Wilsdorf of Rolex grasped that a hermetically sealed case, together with careful fitting of the crystal and a special stem mechanism, would produce a better waterproof wristwatch.He quickly negotiated to have the Perregaux patent assigned to him. Wilsdorf then obtained a British patent on October 18 1926 soon after the Rolex Oyster was born and became a commercial success.
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And an outstanding commercial success
