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Jean Lassale was a Swiss watch company that designed the Calibre 1200, featuring the thinnest mechanical watch movement: 1.2 mm. [1] In the 1970s, Pierre Mathys, [2] master watchmaker in La Chaux-de-Fonds, designed and built the prototype of a revolutionary watch caliber, with the goal of making the thinnest watch in the world.
Some early watches, made before the Omega takeover have a date stamped on the mechanism. The company changed hands in the 1970s and the new owners destroyed many of the old records, making it difficult to precisely date most Regina watches. The records that still exist make it possible to roughly date them by their serial numbers.
MIL-W-46374 is a specification first published on October 30, 1964, [1] for US military watches. [2] The 46374 was specified as an accurate, disposable watch. In its span, it encompassed metal and plastic cased watches with both mechanical and quartz movements. [2] The 46374 replaced the MIL-W-3818, reducing cost and inheriting the dial from ...
Keystone Watch Case Co. was the name of a conglomerate of watch companies assembled by Theophilus Zurbrugg by 1904. Keystone purchased the rights to the E. Howard name (a legacy of the Howard Watch Company ) in 1902 and sold Keystone-Howard watches.
COSC ISO 3159 "Chronometer" certified mechanical watch COSC "Chronometer" certified quartz watch. Each officially COSC certified chronometer is identified by a serial number engraved on its movement and a certification number given by the COSC.
Every watch movement that the company produced through the early 1950s was engraved with an individual serial number. That number can be used to estimate the date of production. Volunteers have created a database of Waltham serial numbers, [103] models and grades, [104] and descriptions of observed watches. [105]
Serial numbers are often used in network protocols. However, most sequence numbers in computer protocols are limited to a fixed number of bits, and will wrap around after sufficiently many numbers have been allocated. Thus, recently allocated serial numbers may duplicate very old serial numbers, but not other recently allocated serial numbers.
The watch was an 18-size, full plate design. In 1869, the National Watch Company won "Best Watches, Illinois Manufacture" at the 17th Annual Illinois State Fair, for which it won a silver medal. [3] The company officially changed its name to the Elgin National Watch Company in 1874, as the Elgin name had come into common usage for their watches.