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1930 Mi.259var, Airmail "Dionisio de Herrera" 20C light brown Mi.180 with Opt SERVICIO AEREO 1930, marginal block of 4, with red Opt of new values VALE 10CTS ORO (Mi.250), and in addition with INVERTED black Opt SERVICIO AEREO VALE 5 CENTAVOS ORO MAYO, which were optd Mi.180 without previous two Opt; neither unissued stamp, or printing error, catalogues don't report, very interesting multiple! U:A5