The main priority of the early Rolex company was to have the highest quality of movement. Wilsdorf first produced the watches using very small and precise movements made in Switzerland. In 1910, Rolex had made the first wristwatch in the word to be granted the Swiss Certificate of Chronometric Precision and, in 1914, a class “A” precision certificate by the Kew Observatory in Britain.
In 1919, the Rolex company moved to Geneva, Switzerland. In 1926, the “Oyster” wristwatch was created, which was the first wristwatch to be both waterproof and dustproof. The Oyster watch was tested in many different areas during the 1930s, including a flight over Mount Everest and a land speed record. The Oyster wristwatch became the standard for durable wristwatches worldwide.