Pioneer of modern flight tests (1896–1943). Flown cover filled out by Allen to indicate that it was flown on an XB-15 test flight in Seattle, Washington, and signed, “Edward T. Allen,” postmarked December 27, 1937. In very good condition, with scattered toning and soiling. Pre-certified Steve Zarelli and RR Auction COA.
Terms and abbreviations used in our descriptions.