Outstanding complete set of seven blocks of four 4¢ Project Mercury postage stamps, each signed in ink by one of NASA's original astronauts. Includes: Gus Grissom ("Virgil I. Grissom"), John Glenn ("J. H. Glenn, Jr."), Alan Shepard ("A. B. Shepard, Jr."), Wally Schirra ("Walter M. Schirra, Jr."), Gordon Cooper ("Leroy Cooper, Jr."), Scott Carpenter ("Scott Carpenter"), and Deke Slayton ("Donald K. Slayton"). In overall fine condition, with poor-to-moderate signature contrast. Accompanied by three commemorative covers honoring the Mercury 7 astronauts, a small glossy photo of the group, and a NASA Facts newsletter covering Project Mercury.
