Mexico, Airmail, 1930, 5c olive green & sepia, "Habilitado 1930" overprint doubled, right margin single with control number, o.g., lightly hinged, rich color, fresh and Very Fine, rare and grossly undercatalogued with only 50 known; with 2007 MEPSI certificate. Scott No. C29a  $225. $0 (Image)