1961-12-20 USA X-15 Flight by Neil Armstrong

This X-15 flight cover, signed by Neil Armstrong, was canceled at Edwards Air Force Base on December 20, 1961—the day Armstrong piloted X-15 number 3 on its first free flight, reaching an altitude of 81,000 feet.

1960-11-30 USA First X-15 Flight by Neil Armstrong

Neil Armstrong, who would later become the first person to walk on the moon, completed his first X-15 flight on November 30, 1960, in the #1 X-15. He followed this with a second flight in the same aircraft on December 9, 1960.

X-15 Goldcraft cachet cover, postmarked at Edwards Air Force Base on November 30, 1960.