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The first Hamilton chronometers were delivered to the Navy in February 1942.

In 1957, Hamilton introduced the world's first electric watch, the Hamilton Electric 500.

and the Hamilton Watch Company was established in October 1892. Production began on a new high quality 18-size, 17-jewel, open face, full-plate nickel movement, designed by Henry J.

Rood purchased the the Aurora Watch Company in Aurora, Illinois at auction. had been producing high-grade and mid-grade watches since 1884, however the company had gone into receivership in late 1889. In June 1892 a group composed of mostly Lancaster residents, including J. Grade movements manufactured evolved, including an upgraded escapement from single-roller to double-roller around 1906, were re-introduced as optionally factory cased in 1924, and upgraded with an Elinvar hair spring and monometalic balance in 1931.Hamilton was successful through the 1920s, buying the Illinois Watch Co. Hamilton introduced the Elinvar hairspring, patented in 1931.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 helping ensure even more consistent accuracy.The trademark Pocket Ben was issued to Western Clock Co.

Remember, the serial number being referred to is the serial number on the movement (i.e. In the beginning of 2003, a few Waltham collectors, including Tom Mc Intyre and myself began development of the Waltham Database. Henry J Cain replaced Bitner as superintendant in mid-1889 and began reorganizing the factory with the goal of introducing a new product line. Other 18-size pocket watch movements manufactured to meet railroad time service requirements included: Hamilton began producing 16-size watches for railroad service in 1896.