Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 182:
1930 (December 2), registered cover delivered by Ad Astra Aero Africa Flight on leg Zurich – Cartagena – Alicante, franked by three stamps, blue confirmation cachet, undelivered and returned to Fribourg on December 11, appropriate markings on front and reverse, F/VF, Scott #C9, C12
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