Nice collection of four covers honoring Project Mercury, each signed by one or more of the Mercury astronauts. Includes: a first day cover with a block of Project Mercury stamps, signed in ballpoint by Scott Carpenter, Wally Schirra, and Gordon Cooper; a first day cover honoring John Glenn's historic MA-6 orbital flight, featuring Glenn's facsimile signature, signed in ink by Scott Carpenter and Gordon Cooper; a cover honoring Mercury-Atlas 8, signed in black ballpoint by Wally Schirra, who adds: "Sigma 7 to Apollo 7"; and a Mercury-Atlas 9 launch day cover, signed in black felt tip by Gordon Cooper. In overall very fine condition.
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