"In the early 1970's Roland Brown devised a means of measuring the check letter positions of the Penny Black and the Penny Red. He devised a transparent gauge that when overlaid on a stamp and aligned with the frame lines could measure the letter position to 1/30th of a millimeter.
Harold Fisher joined forces with Roland and early in 1972 the first of what would come to be five volumes was released covering the first 45 plates. Within 6 months the printing had sold out and increasing numbers of inquiries about continuing volumes were coming in from those interested in plating.
After completing more than half the data necessary . . ."