Illinois pocket watch dating
6/0-size women's wristlet watches were introduced in 1912.
Hamilton introduced its first wristwatch for men in 1917, designed to appeal to men entering World War I.
Hamilton and Buren were operated as a joint concern. Watch manufacturing operations were moved to the Buren factory in Switzerland.
The last American manufactured railroad pocket watch was the grade sold by the Hamilton Watch Co. The Hamilton Watch Company changed their name to HMW at the time they sold their Watch division to SSIH in 1971.
The company was reorganized again in 1886, this time as the Keystone Standard Watch Company, primarily selling lower quality watches. Grade was the corresponding 21-jewel, hunting case version, available from 1898 to 1920 was also popular with over 26,000 movements manufactured.
In the early 1960's Hamilton produced a railroad electric wrist watch using a Hamilton 505 movement, which was briefly approved for use on some railroads, although it was later withdrawn due to issues with reliability.
In 1966, Hamilton acquired the Buren Watch Company in Switzerland, including all factories and technologies that had been developed by Buren up to that point. in 1969, with the closure of its factory in Lancaster, although watches were still being assembled from parts and finished for several more years.
Hamilton expanded its product line by introducing 0-size movements for women in 1908, these were designed to be worn suspended from a breast pin.
12-size pocket watch movements for gentlemen were introduced in 1909.