6c Brown, Plate Proof on Card (256P4). Bottom imprint and plate no. 28 block of six, huge margins to full, brilliant color

VERY FINE AND CHOICE. A VERY RARE PLATE BLOCK OF THE 6-CENT BUREAU ISSUE PLATE PROOF ON CARD.

We have previously offered a plate block from the top position. These two may be unique. Ex Whitpain as a plate block of twelve

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