By the calibre 300, 280 (very flat with 2,8 mm, and acclaimed as very precise, in 1960), and cal. Buren participated in the race to ever flatter watches, e.g. 40, 45, 35, 60, 295, 350, 50, 356, 14, 370, 410, 380, 462, 30 and 565). Developed rapidly new wrist watch calibres ( no. From 1932 onwards the Buren Watch Company S.A.
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This continued until 1972 when Buren was sold off entirely. Buren was sold to the Hamilton Watch company and began taking over US production of Hamilton watches. Then, in 1966, history happened. They were the inventors of the micro-rotor and a list of other calibers.
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