11c Light Green, Perf 10 at Bottom (511a). Top plate no. 13469 block of six, bottom left stamp with transitional perforations at bottom, others normal perf 10, bottom center stamp lightly hinged, others incl. variety Mint N.H., radiant color

AN EXTREMELY RARE PLATE BLOCK OF THE 11-CENT PERF 10 VARIETY. ONLY FOUR SUCH PLATE BLOCKS ARE KNOWN. AN OUTSTANDING EXHIBITION PIECE.

One of the four recorded plate blocks containing Scott 511a was offered in the Zoellner sale, and came from plate no. 13470 (it has two Perf 10 stamps in the bottom row). Another recorded plate block is from plate no. 13467 and is very off-center with perfs touching at right. A third plate block from plate no. 13467 has three Perf 10 stamps in the bottom row, including a transitional 11-to-10 gauge.

With 2007 P.F. certificate

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