Buren Watch Company Calibers

Buren Watch Company was a Swiss watch manufacturer founded in 1898 in Büren an der Aare (canton of Berne) through the acquisition of Fritz Suter & Cie by the London firm H. Williamson Ltd. The company became fully independent in 1932 when employees bought back the plant. Buren's place in horological history rests on a single landmark innovation: the Micro-rotor automatic movement, patented in 1954, which integrated the oscillating weight entirely within the movement plane — enabling dramatically thinner automatic watches than the traditional large rotor permitted.

The micro-rotor concept was licensed and copied across the industry, appearing in movements from Patek Philippe, Audemars Piguet, IWC, and many others — making Buren's contribution foundational to modern thin-automatic watchmaking. In 1966, Hamilton Watch Company acquired Buren and relocated all Hamilton production to Switzerland by 1969. The Hamilton-Buren partnership ended around 1972. Buren-based movements also contributed to the joint-development Chronomatic automatic chronograph with Heuer and Breitling. Collectors prize original Buren micro-rotor movements for their historical significance.

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Manufacturer Movement
Buren Watch Company Automatic 17.5 mm
Buren Watch Company Automatic 17.5 mm
Buren Watch Company Manual 23.69 mm
Buren Watch Company Automatic 28.5 mm
Buren Watch Company Automatic 28.5 mm
Buren Watch Company Automatic 28.5 mm
Buren Watch Company Automatic 28.5 mm
Buren Watch Company Automatic 28.2 mm
Buren Watch Company Automatic 28.2 mm
Buren Watch Company Automatic 28.5 mm
Buren Watch Company Automatic 28.5 mm
Buren Watch Company Automatic 28.2 mm
Buren Watch Company Automatic 31.02 mm
Buren Watch Company Automatic 31.02 mm
Buren Watch Company Automatic 28.5 mm
Buren Watch Company Automatic 28.55 mm
Buren Watch Company Automatic 28.5 mm
Buren Watch Company Automatic 28.5 mm
Buren Watch Company Automatic 28.5 mm
Buren Watch Company Automatic 28.5 mm
Buren Watch Company Manual 23.69 mm
Buren Watch Company Manual 25.94 mm
Buren Watch Company Automatic 31.02 mm
Buren Watch Company Manual 19.9 mm x 26.85 mm
Buren Watch Company Manual 23.69 mm
Buren Watch Company Manual 25.94 mm
Buren Watch Company Manual 25.94 mm
Buren Watch Company Automatic 31.02 mm
Buren Watch Company Manual 43 mm
Buren Watch Company Manual 43 mm