Not all Helvetia watches have a serial number inscribed on them and early trench watches, chronographs and triple date watches often have a different format serial number that, unfortunately, I cannot use to date these watches. Serial numbers are usually inscribed on the inside or outside of the case back often with a case number. Using information from hallmarks, inscriptions, movement types, patent applications and the style of watch I have developed a database to allow the reasonably accurate dating of Helvetia watches from these numbers. They continue to about 6,100,000 in 1973 when they changed their serial numbering system. It looks as if the numbers are a continuation of, and are combined with, the General Watch Company's pocket watch serial numbers. Helvetia serial number marking on their watches appear to start at about 2,000.000 in about 1914.
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