 Some Illinois 12/0-size 207 movements were finished with the Hamilton name and used in the 401 series of Hamilton wrist watches, which premiered in 1934 and were named after famous explorers including Stanley, Livingstone, Byrd, and others.Many Illinois collectors also collect these pieces since they contain movements derived from Illinois-made movements.Some think that the Hamilton Watch Company purchased the Illinois Watch Company merely to expedite the production of a rectangular-shaped movement, but this is uncertain.