6c Proprietary, Perforated (R31c). Faintly cancelled (appears unused), faint trace of a crease at top, possibly reperfed at right, small thin spot, still a Fine example of this key First Issue perforated stamp, Scott Catalogue notes "Nearly all examples of No. R31 are faulty or repaired and poorly centered. The catalogue value is for a fine centered stamp with minor faults which do not detract from its appearance", Offered on behalf of Harvard University

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