Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 13:
1918 (July 15), cover from New York to Washington, DC, sent from the Aero Club of America with letterhead of the Club, addressed to Major J. C. McCoy, franked by 16c green (new air mail rate started exactly on July 15), violet ”Via Aeroplane Mail”, flap is slightly damaged, still F/VF and rare, especially intact the Aero Club document, Est. $300-$400, Scott #C2
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