Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 66:
1929 (July 14), First Flight cover from Guayaquil – Valparaiso, franked by red Postal overprint on 2c green in vertical strip of three and uprated by semi-official Airplane overprint on 1c green (Sanabria #529), flight markings and arrival ds, F/VF, Scott #302
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