After the first world war,the Rolex company immigrated back to Geneva
,the company continue to create,and perfect itself under the push of the founder.The two research direction for him is waterproof and automatic.In the year of 1926,the first waterproof and dustproof watch was born which famous all the world as the Oyster.In 1929,the economic crisis hit the switzerland but the Rolex company didn't get the influence by it.In this period,the first waterproof and dustproof watch was invented by people.This kind of watch owned a kind of rotor which had never been used in the before history and brought a huge revolution.So far,it is still the pioneer for the automatic watch.In the year of 1945,the company built the watch with a date shown and twenty-six language function.