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Illinois Watch Co.

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Illinois Watch Company Price List (April 1926) Contains a list of movements and watches offered by the Illinois Watch Company effective April 1, 1926. Includes Bunn Special, Sangamo Special, A. Lincoln, Illini, Marquis-Autocrat, the Mary Todd, and other numbered grades. https://pocketwatchdatabase.com/guide/company/illinois/catalogs/illinois-watch-co-price-list-april-1926
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Pictured: Measurement on a Standard Regulator Screw from 16-Size Illinois Model 4 (5.25mm) The patent application submitted by Arthur Bonnet in March 1910 for his automatic temperature compensating screw indicates the effectiveness relies on using softer steel with less carbon content. In 1910, Bonnet’s design...
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Pictured: “Temperature Compensating Mechanism” Patent #968235 In 1910, the Lincoln Watch & Jewelry Company secured a patent for an improvement to the regulator used on its watches, designed to provide additional temperature compensation. The patent was issued to Arthur Bonnet on August 23, 1910, and...
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