In 1953, Tissot celebrated its 100th birthday. The arrival of Edouard-Louis Tissot in the role of managing director marked a turning point in the industrial organisation of Tissot. Thanks to the introduction of a "single calibre" principle in 1958, the range of movements was simplified and production was rationalised. Indeed the addition of different complications to a basic movement made it possible to produce manual or automatic watches, with or without a calendar and day-date, which were sold around the globe. In view of the company's success, official visits multiplied, and in 1960, the guest book immortalised a visit of the prince and princess of Monaco.
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