The first movements in Rolex watches were made exclusively by Aegler in Switzerland. Hans Wilsdorf made trips to Bienne several times a year working closely with Hermann Aegler on technical development.
The First Oyster
In 1919 Wilsdorf started the move towards In-House, when Rolex purchase a big stake in Aegler, though they remained separate companies. This was until 1920 when Hans Wilsdorf changed the official name to Rolex SA, its official designation today. So without further ado, and with an Aegler movement that can now be classed as In-House, the revolution started in 1926. Yes, the first Oyster case. Its “waterproof” case was released onto the market swiftly after Wilsdorf bought the legal rights to the screw-down crown.
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