Member of Astronaut Group 3 (born 1932) who served as the backup pilot for Gemini 10 and was then slated as the LMP for the Apollo 9 backup crew (the eventual prime crew for Apollo 12), but died in a NASA T-38 jet trainer crash near Tallahassee, Florida, in 1967, before ever traveling into space. Block of four Project Mercury 4-cent stamps, 4 x 2.25, signed in the left margin in blue ballpoint, "C. Williams." In fine condition.
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