Two flown covers with stamped NASA Flight Research Center cachets: one signed in black felt tip, “Fitz Fulton Pilot,” and “Vic Horton, Flight Test Engineer,” adding “Carried on YF-12C research mission at supersonic speed 26 April 1973”; the other signed in blue ballpoint “Carried on NASA Research Mission in YF-12C # NASA 937, 15 Dec 73, max speed and altitude 2.60 Mach and 674000 feet. Fitz Fulton NASA Test Pilot.” In fine condition. YF-12C was the secret code name for the SR71 Blackbird test flights. Pre-certified Steve Zarelli and RR Auction COA.
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