Uncommon commemorative cover with a stamped cachet honoring the X–15 aircraft and its various affiliations, postmarked at Edwards Air Force Base, May 17, 1957, and signed in various inks by eight X–15 pilots. Signers are: “Forrest S. Peterson, X–15 Pilot USN,” “Joe Engle,” “Robert M. White, X–15 Astronaut,” “Wm. J. Knight, X–15 Astronaut,” “Scott Crossfield,” “Robert A. Rushworth, X–15 Pilot Astronaut,” “Bill Dana,” and “Milt Thompson, X–15 Pilot.” In fine condition, with some slight haloing to the Engle signature. The Leon Ford Collection. Pre-certified Zarelli Space Authentication.
Terms and abbreviations used in our descriptions.