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Flown cover with a "First Official Missile Mail" cachet, carried on the Regulus I training guided missile launched from the USS Barbero on June 8, 1959. Includes a facsimile letter from Postmaster General Arthur E. Summerfield, in part: "Your receipt of this letter marks an historic milestone in the use of guided missiles for communications between the peoples of the earth…A limited number of letters identical to this one were placed in the Regulus I Training Guided Missile on the guided missile submarine USS Barbero (SSG-317) in this First Official Missile Mail experiment of the United States Post Office Department. The missile was then flown at near the speed of sound from international waters of the Atlantic Ocean by the USS Barbero while on a regular training mission. After the Regulus I reached its destination, the Naval Auxiliary Air Station at Mayport, Florida, near Jacksonville, this letter was cancelled and forwarded to you as a significant philatelic souvenir." In very fine condition.
