![]() ![]() Later 16-size movements were marked with the series numbers, but not the earlier ones. The grades of many Keystone-Howard movements are identified by their series numbers. This means that determining the date of a movement is very difficult beyond a few key dates. date tables that are based upon dividing the overall range of serial numbers by the total years the watches were in production just don't apply. The rate of production of Keystone-Howard watches was not always a constant. 1912 or 1913 sounds about right for the date. It sounds like you have a 19-jewel, 16-size, open-face watch which is a grade that Keystone-Howard later marked as the Series 5. Welcome to the NAWCC Pocket Watch Message Board!
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