6c Grandma Moses, Black Engraved & Prussian Blue Omitted (1370b). Mint N.H. "plate no. block" of four, without the usual mottled gum, bright colors, Very Fine and rare as a plate block (with missing plate number), with 1994 P.F. certificate, listed in Datz as a plate block but unpriced, Scott Retail as four singles

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