$3.00 1964 Hunting Permit (RW31). Mint N.H. top left plate no. 168629 block of six, choice centering, fresh and Extremely Fine and scarce, beginning in 1958 Duck stamps were printed by rotary press and plate blocks were collected as corner blocks of four, this issue had the plate number mistakenly entered above or below the second stamp from the left, collectors assumed a plate block of four was still the correct format and many sheets were broken in this manner before the realization that the correct format for this issue is a block of six

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