$3.00 1964 Hunting Permit (RW31). Mint N.H. top right corner plate no. 168630 block of six, fresh colors, Fine-Very Fine, 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 no. mistakenly entered above the second stamp from the top 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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