UMBERTO NOBILE 1928, average of the airship ITALIA during the North Pole expedition, scarce donation stamp to the factoring the bailout, two private overprinted airmail stamps 1, 20 L, a value with reverse like issued black overprint \"Esplorazione Polar NOBILE Dirigibile Italia 1928\" and on face green overprint \"Esplorazione Polar 1928 / Ricerche Dirigibile Italia\", a value in of the rare variety with on face black overprint, both perfect mint never hinged, edition in total only 1000 pieces, photo expertize Asinelli \". Originali, . Perfetti\"