10c Banking & Commerce, Horizontal Pair, Brown, Blue & Yellow Litho Omitted (1578c). Mint N.H. top left corner Zip block of four, tiny stain on back at top, Very Fine, a unique position piece, only 16 pairs (from one pane) are recorded by Datz and no other examples appear in Power Search outside of this sale, with copy of 1991 P.F. certificate for the unique discovery pane from which this block originates, also accompanied by normal Zip block from the same position on the plate, making for a dramatic comparison, Scott Retail for two pairs without premium for the position

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