In the instances of two digit catalog numbers, the movement is the 23-jewel series 0. The two rightmost digits of a catalog number identify case material and style and the remaining digit(s) to the left are the series number. The catalog numbers are two, three or four digits. Essentially, the only indication of the movement series numbers in Keystone-Howard catalogs is in the complete watch catalog number. Selman (Sandy) Berger discusses the subject in great detail in his article "Some Aspects Regarding the Significance and Evolution of Model Number Designations for Keystone Howard Watches," NAWCC Bulletin, June 2001, pages 305-309. This fact has caused a great deal of confusion in identifying the series of unmarked movements, especially the 21-jewel series 1 and 10, and the 17-jewel series 2, 3, 4 and 9. 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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