ejsxs, yes, your chart information from the Serialization Book is correct. The chart that is incorrect is Robin Lewis's chart from the PGCA website forum thread that is linked on this thread. That chart didn't have the appearance of a chart taken directly from a Remington-Parker document, looks more like a chart made on a computer. It has at least three errors in measurements, maybe more. Yes, distance between pins on #1 frames and #1/2 frames is 1 1/16".