I'm not sure whether Parker marked the vent ribs with roll dies or hand engraving, but the standard ribs, including flat ribs, were roll stamped for the maker markings and barrel steel. The matting was machine cut one line at a time with a special matting machine and indexed over the proper amount for the next line. The matting machine was designed with a cam plate that raised and lowered the single point cutter to create the blank window around the lettering.
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