American pilot and physicist (1921–1966) who reached the edge of outer space on two separate X-15 aircraft flights in 1963; he tragically passed away when his F-104 Starfighter crashed during a publicity photo shoot. Vintage fountain pen signature, “Joe Walker,” on an off-white 5 x 3 card. In fine condition. Pre-certified Zarelli Space Authentication.
This item is Pre-Certified by STEVE ZARELLI
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