6c Dull Brown, USIR Watermark (271a). Clear "R" watermark, three large to huge margins, rich color, oval numeral grid cancel, few unpunched or short perfs at top, appears simply to be a production defect rather than damage

FINE CENTERING. A RARE USED EXAMPLE OF THE 6-CENT 1895 "USIR" WATERMARK ERROR. ONLY 26 ARE KNOWN TO US.

The "USIR" (United States Internal Revenue) watermark error occurred when a supply of paper reserved for revenue stamp production was used for printing the 6c and 8c postage stamps. Our updated census of this issue records 24 used copies certified as genuine by the Philatelic Foundation, plus two uncertified copies.

Signed Sloane

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