SIPEX, Sixth International Philatelic Exhibition, Washington, D.C., 1966 Poster Stamp

SIPEX, Sixth International Philatelic Exhibition, Washington, D.C., 1966 Poster Stamp

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SIPEX, Sixth International Philatelic Exhibition, Washington, D.C., 1966 poster stamp / Cinderella label.  Full gum, never hinged.  See scan.   Size:  51 mm x 39 mm.