6c Proprietary, Perforated (R31c). Rich color, light strike of blue 1871 datestamp, faults as always for this issue including several creases, otherwise Fine, Scott Catalogue notes "Nearly all examples of No. R31 are faulty and poorly centered. The catalogue value is for a fine centered stamp with minor faults which do not detract from its appearance."
Image Magnifier / Download
Power Search for Comparables