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FINE. THE UNIQUE BOTTOM IMPRINT AND PLATE NUMBER BLOCK OF SIX OF THE 1894 6-CENT UNWATERMARKED BUREAU ISSUE IMPERFORATE HORIZONTALLY. ONE OF THE GREAT RARITIES OF THE ISSUE.
Brookman notes that the source of this error is likely a western post office. A block of fifteen from the lower right corner of the sheet is also known. The unique top plate block of nine was offered in our 2009 auction of the Whitpain collection. (Image)