6c Dull Brown, Imperforate Horizontally (256a). Vertical block of six containing two error strips of three, middle stamps Mint N.H., others lightly hinged, brilliant color, exceptionally choice centering for this error, which is almost always encountered centered strongly to left

EXTREMELY FINE. A RARE AND CHOICE BLOCK OF THE 1894 6-CENT UNWATERMARKED BUREAU ISSUE IMPERFORATE HORIZONTALLY.

Brookman notes that the source of this error is likely a Western post office. Most examples we have encountered are centered to the left to varying degrees. This block with centered stamps is a true condition rarity.

Scott Retail as two pairs without premium for the extra stamps

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