24c Carmine Rose & Blue, 1918 Air Post (C3).
Tied by "Air Mail Service Wash. N.Y. Phila. New York Jul. 15, 9AM 1918" duplex cancel on First Day of New 16c Rate
cover to Philadelphia, ms. "Aeroplane Mail",
arrival backstamp, Very Fine, a scarce use of the first Air Post stamp overpaying the new 16c rate on the first day of the rate, naturally these covers would normally be franked with No. C2
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