
50c pale blue 'OFICIAL' overprint issue further overprinted 'Correo Aereo' in blue with variety OVERPRINT DOUBLE ONE INVERTED, a fine mint copy. (SG O619c)
50c pale blue 'OFICIAL' overprint issue further overprinted 'Correo Aereo' in blue with variety OVERPRINT DOUBLE ONE INVERTED, a fine mint copy. (SG O619c)