6c Ultramarine & Carmine, Error of Color (C23c). Group incl. three blocks of four and six singles, one corner margin block Mint N.H., second corner margin block not hinged but with pencil guarantee notations on each stamp, third block with vertical guide line, pencil notations, singles incl. two Mint N.H., three others with pencil notations on gum, Fine and scarce group, two normal stamps accompany for comparison, Scott Retail as singles

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