3c Blue Green, Douglas Patent Punch, Double Paper and Punched with Eight Small Holes in a Circle (207 var). Bottom imprint and plate no. 367 block of ten, original gum, h.r., rich color, each stamp with the eight patent punches in a circle, few trivial perf separations, a few surface flaws endemic to this patented paper

VERY FINE. AN EXCEEDINGLY RARE AND POSSIBLY UNIQUE PLATE BLOCK OF THE 3-CENT RE-ENGRAVED WITH DOUGLAS PATENT PUNCH APPLIED TO THWART CANCELLATION REMOVAL.

The Douglas Patent was designed to prevent the re-use of stamps through printing on two thin layers of paper, which would break apart when removed from a cover. It is reported that some were sold at the Washington D.C. post office.

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