His best and most stable client was Patek Philippe, which commissioned him to design and manufacture a large number of world time zone watches. Vacheron Constantin, Agassi and Rolex also commissioned him to design world time zone watches, and Cotill quickly became a well-known person in the industry.
In 1935, Master Cottier invented the Heures-Universelles (HU) watch mechanism. This ingenious structure seemed to have fulfilled the 24 time zones of the world previously summarized by Sanford Fleming. The HU mechanism accommodates 24 time zones on the same dial.
In 1937, after two years of careful research and development, Cottier finally produced the world's first world time watch for Patek Philippe - Ref. 515. He installed a separation mechanism inside the movement, that is, when the user presses the adjustment button, the hour hand and the city outer ring move one grid in opposite directions, but the minute hand is always connected to the movement. This enables the movement to maintain accurate time.
In the same year, he made the world's smallest world time zone watch for Patek Philippe. From 1937 to 1938, he made a three-calendar complex world time zone table clock for Patek Philippe, which is now on display at the Beyer Museum in Zurich.
In 1940, at the request of Patek Philippe, Cottier made a watch with both world time zone and pulsometer functions for one of the company's customers, a doctor in Paris.
In 1946, in order to thank the Allies for their contribution to the just-concluded World War II, the citizens of Geneva designed by Wenger and Cottier made four gold world time zone watches decorated with enamel for Agassi. These four watches were given to several major military leaders at the time: Churchill, President Truman, Stalin and General de Gaulle. Cottier also made a world time zone table clock for President Roosevelt's widow.
By that time, Cotillard had become a famous watchmaker, and the Patek Philippe Platinum World Time Men's Watch Ref-1415-HU, which once set a world record for watch auctions, was made by him in 1939.
The identical Patek Philippe Platinum World Time men's watch Ref-1415-HU in Yang Jing's hand was made by Master Cottier in 1940, and the customer was the doctor in Paris.
All of this is on the three pieces of letter paper wrapped with the watch...
PS: I would like to thank "Lights See People" and "Ink Fragrance and Charm" for their rewards of 100 each.
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