| A 20th Century American lever with power reserve indication in a gold filled open face case. Nickelled split three quarter plate keyless movement with going barrel. Plain cock with polished steel micrometer regulator, compensation balance with blue steel overcoil hairspring. Club foot lever escapement,
escape and lever pivots with endstones in gold settings. Signed white enamel dial with subsidiaries for seconds and power reserve, bold Arabic numerals and blue steel hands. Plain open face case, screw on back and bezel Hand set lever under the front bezel at 11 o'clock, the inside of the back marked "Hamilton Keystone Watch case - J Boss - 10K Gold Filled - Railroad Model".
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