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Stamps in sheets are stacked in quantity and the combis punched through the top row. Then the comb is movedto the next row and so on. The comb does not alwaysline up exactly with the preceding row so that this styleof perforation can often be identified in any vertical pairof stamps. However, it has never come to our attentionthat these variations in the placement of the comb havereceived any important consideration among collectors. Usually the punches, or prongs, that make the per-forations are round in shape. They need not be, however, and sometimes they are oblong, or lozenge, in shape orperhaps some other shape. Collectors refer to these oddshapes as "hyphen hole" perfs., or "Lozenge" perfs., and"square" perfs. |
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