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Douglas M-2, 1936. Creator: Douglas Aircraft CompanySingle engine, single seat, bi-plane, liberty V-12 engine; used by post office and Western Airlines. Designed to replace de Havilland DH-4s for delivering the air mail in the mid 1920s
5c Buffalo Balloon imperforate vertical pair, 1877. Creator: Unknown5c Buffalo Balloon imperforate vertical pair, 1877. Perhaps the most enigmatic of all American stamps, the Buffalo balloon stamp is certainly among the premier rarities in aerophilately