Proof 15c Indigo plate proof on stamp paper (227Pa), mint horizontal pair, ample to large margins all around, full o.g., lightly hinged, fine-very fine, with 1981 P.F. certificate, Scott retail $750.00 photo
Proof 15c Indigo plate proof on stamp paper (227Pa), mint horizontal pair, ample to large margins all around, full o.g., lightly hinged, fine-very fine, with 1981 P.F. certificate, Scott retail $750.00 photo
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
