Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 7:
1918 (July 15), two First Flight covers Washington, DC – Philadelphia and New York – Washington, DC, the last one is reduced at left, each one franked by 16c green (new air mail rate started exactly on July 15), both mounted on page with detailed explanation, F/VF, Est. $600-$800, Scott #C2
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