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Any Swatch service center can perform repairs on your modern Hamilton watch. Click here for an explanation and example of how to use our serial number tables. Click here for instructions on how to identify and open most common case types.Be sure to use the serial number on the movement (the works) of the watch. Hamilton also used serial numbers preceded by a letter on certain grades from about the late 30's until the late 60's.
Grant was President of the United States and Conestoga wagons creaked their way along the Lancaster Turnpike, as citizens heeded the call of Horace Greely to "Go West." Another form of pioneer was building a factory in the pastoral community of Lancaster, Pennsylvania. American soldiers during World War I preferred the smaller size and convenience of the wristwatch to the "old-fashioned" pocket watches.
The Adams and Perry Watch Company was built right beside the turnpike. They brought skilled watchmakers to Lancaster and began production in 1875. This trend caused a major shift in American watch production, with a new emphasis on producing wristwatch models for both men and women.
Hamilton was granted the land by William Penn's heirs and is credited with founding the city of Lancaster with his son James. The Elinvar hairspring was patented in 1931 and used in all movements thereafter.
Hamilton Watch was founded by merging Keystone with the Aurora (Illinois) Watch Company. The name Elinvar was derived from the term "Elasticity Invariable" and was the first alloy to resist the changes in elasticity that occur with changes in temperature.
As a result, the company produced watches under three brand names – Hamilton, Vantage and Buren – in six plants in this country and abroad, manufactured sterling and plated silverware, fabricated and processed rare and exotic metals, and produced mechanical and electronic measuring devices and components.