90c Post Office (O56). Bottom imprint and plate no. 88 block of 30 (10x3) with selvage on three sides, unused (no gum), centered to the top, a few small faults mostly in the bottom selvage, overall a Fine example of this rare plate block, Scott Retail $3,000.00 as an original-gum plate block of twelve, we have offered only two other plate blocks of No. O56 of any size since keeping computerized records -- from the Barnes estate and probably acquired before World War II

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