5 C. till 1 Pta "900 years abbey Montserrat", airmail issue 1931, perforated L 14, reverse always control number "A000, 000" being a Specimen set, in perfect condition mint never hinged, so very rare offered, photo expertize Eichele: "genuine and immaculate", Edifil no. 650 / 54N, Michel free of premium for the on the back Specimen overprint "A000, 000" 350.