You usually have to take the back off the watch case to see the movement serial number which may appear anywhere on the watch movement. Cases and watches were often made by different companies and each usually has its own serial number. not the serial number from the watch case. the working part with the wheels and gears. You must use the serial number from the MOVEMENT of the watch. Instructions for using our serial number look-up tables
Callwey, 1992, Munich, Büren (Kocher was the last director of Buren watch). Source: Hans Kocher-Aeschbacher, „Die Geschichte der Uhrmacherei in Büren“, ed. But the markets for Buren-Hamilton watches suddenly shrank, 1972 the factory was liquidated. Hamilton transferred its production 1969 to Büren, doubling its capacity to about half a million pieces. In 1966 the swiss-american owner Gsell wanted to retire and engineered the aquisition of Buren by the Hamilton Watch Company (USA). 11 „Chronomatic“), where the crown (seldom to use in an automatic watch) was set at the left of the dial, the two chronograph push-pieces at the right side.
The automatic mouvements were further developed, together with Breitling, Heuer-Leonidas and Dubois Depraz, to build the world‘s first automatic chronograph in 1969 (cal. Complication-Piaget or IWC, the patent for Intramatic was licensed to Baume & Mercier, Bulova and Hamilton (used in the 'Thin-O-Matic' line). The patent for Superslender was licensed – together with Universal of Geneva to other firms, eg. The watch was called „Superslender“ (calibres 10 and produced from 1957 onwards), then adapted to „Intramatic“(cal. 525 was started, an automatic bumper movement watch, in 1953 the automatic calibres 535-539 with „Rotowind“(with second hand from center, or power reserve indication).ġ954 Buren established the patent for its Minirotor – the small rotor integrated at the same level as the rest of the movement, which can thus get very flat. All parts were still manufactured inhouse. 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. to sell the facilities in Büren to a local group of new shareholders and the swiss-american financier Roland Gsell.įrom 1932 onwards the „Buren Watch Company S.A.“ developed rapidly new wrist watch calibres ( no. The crisis after 1929 forced Williamson Ltd. Annual production in Büren was about 200'000 time-pieces. In 1925 a patent for the stones used as bearings was granted, these stones being pressed into their place, as applied today in every watch.īetween 19 a broad set of pocket and wrist watches was developed (calibres 373, 25, 335, 385, 375, 378, 875, 415, 400 tonneau, 975, 460, 461, 462, 293 and 70). From 1916 to 1923 a kind of interchangeable parts for the different calibres were developed. London bought the label and the factory, increasing the production of pocket watches in many calibres, all manufactured completely inhouse. Suter-Antenen produced pocket watches, first with cilinder escapement, after 1885 with Anker escapement, winding with key.ġ898 H. Founded 1873 in Büren, a medieval little town at the river Aare in Switzerland, by Fritz Suter-Antenen.
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