Chuck,
When you reference the marks in the stock book, are you in fact speaking of actual stamped marks? Or hand written marks.
In the writing of my article that touched on this topic, it was confirmed that they were hand writing in 1/2 as an abbreviation for 1-1/2 (in the mid-late 1920s). Whereas in later books they actually used a 1-1/2 stamp.
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B. Dudley
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