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The Prentiss 93 was made for a number of years. Earliest ones will have no markings at all other than mayby a P.V.CO below the spindle (1880s-1900) Then came the "graffitti script" ones that you most often associate with Prentisses (1900-1910). After that they went to an arched text similar to later Columbians (1910-1930).