The cases were produced using a range of metals, from nickel to 18K solid gold, and were marked with a grade such as the J. or a Keystone-Howard serial number chart.Īdditionally, owners interested in information regarding the pocket watch case can determine the quality and rough date of production by identifying the grade of the case. Howard Watch Co., and owners who assume production was between 19 can reference either a Keystone Watch Case Co. watch owners who suspect production dates from 1858 to 1902 should refer to a serial number chart specifically for the E. Charts to match a serial number with a pocket watch’s date of production can be found online from watch retailers and repair services like Vintage Time Pieces and Renaissance Watch Repair.
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