Illinois Sangamo Special Model 9, 23-jewel, adjusted to 6-positions, patent regulator. mfg. circa 1915. Dial is a 24 hour dial designed for railroad service in Canada. The 16-size, Model 9, 21-jewel and 23-jewel Sangamo Special grade was introduced in 1913 as Illinois new premier 16-size movement for railroad service.
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