8. Perforations fully doubled or tripled: Early examples of doubled perforations done on hand-set perforators are not scarce and can even be found on cover; priced in the $25-$40 range. Modern doubles are very difficult to find and command prices of $75 and up for a pair. A recently discovered variation is doubled or tripled comb perforating (which is extremely rare) on the 1983 wildflowers issue. A full pane should retail in the $500 range.
Type 8: This block of Scott 26 has vertically doubled perforations resulting from two entries into the perforator.