JOHN GLENN SIGNED MERCURY LAUNCH POSTAL COVER.
Postal envelope having a blue cachet illustrating John Glenn and describing his three orbit flight. Cape Canaveral, Florida postmark dated 20 February 1962, with: "First Day of Issue."
SIGNED by JOHN GLENN and GORDON COOPER. SIGNED and INSCRIBED: "JAMES E. WEBB, Adm. NASA, 1961-68."