6c-24c 1918 Air Post (C1-C3). Over 20 covers, C1 Dec. 17 and 18, 1918 usages (Dec. 16 was first flight), four C2 July 15 First Flights (two legal-size, one to FDR), C3 May 15 First Flight, C1 block of four and single C3 tied by boxed "Guam, Guam", 1933 registered use to Los Angeles, two C2 used with three different "EU" Scadta machine overprinted stamps, Guatemala 5q Orange registered use to U.S. with C2 for Air Mail postage from New Orleans port of entry to Pennsylvania (forwarded to New Jersey), very mixed condition, still much Fine and better

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