Commemorative cover with a cachet honoring the four minority Shuttle astronaut candidates, signed in black ink and felt tip under their images in the cachet by Ronald McNair, Guion Bluford, Ellison Onizuka, and Frederick Gregory. In fine condition. McNair and Onizuka perished in the 1986 Challenger Space Shuttle disaster. Pre-certified Steve Zarelli and RR Auction COA.
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