(22c) "D" Rate, Vertical Pair, Imperforate Horizontally (2211b). Three Mint N.H. items, block of four with right "Zip" margin, imprint corner margin pair from the same multiple, also additional block of four in a slightly different shade, each with blind perfs where necessary to define the error, Very Fine, with 1986 P.F. certificate for a block of eight from which the first two pieces originate, with printout of P.F. certificate no. 194021 for the additional block, Datz states only 5 pairs recorded, there is at least one more than that but obviously this is a rare error

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