1c Green, Perf 10 at Bottom (498g). Top plate no. F 13381 block of six, bottom stamps show transitional perforations with right stamp Perf 11, center stamp transitional Perf 10/11, left stamp Perf 10, bottom left stamp and two stamps at top lightly hinged, others Mint N.H., deep rich color

VERY FINE. ONE OF ONLY TWO KNOWN MULTIPLES OF THE ONE-CENT GREEN 1917 ISSUE PERF 10 AT TOP OR BOTTOM, SHOWING TRANSITIONAL PERFORATIONS AND WITH PLATE NUMBER AT TOP. ONE OF THE MOST IMPORTANT 20TH CENTURY PERFORATION RARITIES.

At a certain point during production one of the perforating wheels became defective. In the course of repairs part of one perforation wheel was inadvertently changed from Perf 11 to Perf 10. Based on the physical evidence of surviving copies, this was the nineteenth row of pins on the wheel. Many examples of the Perf 10 on One Side rarities show transitional perfs where the out-of-gauge perforation pins crossed the span of more than one stamp.

Our census of this rarity contains 12 unused (including two in a block of four, four in a block of 25 and and two in this plate block of six) and seven used examples (two are part of a block).

Census No. 498g-OG-BL-02. With 2003 P.F. certificate. Scott Retail as one hinged and one Mint N.H. example of the variety without premium for the plate block

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