10 Billions on 50 millions, black opal green, corner margin block of eighth top left - fields 7-10 and 17-20, rotary printing upper margin, OPD Erford, as well two values with combination 0'7'0 as well two values with combination 1'5'1, in perfect condition mint never hinged, unsigned outstanding quality, photo expertize Tworek BPP: "genuine, mint never hinged, perfect. ", Michel 20.800.- - Top-rarity the Infla philately!