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Plaque for Sigma 7 (NASA mission page) circa 2013. It reads

SIGMA 7
October 3, 1962
Astronaut Walter M. Schirra, Jr.
6 Orbits -- 9 hours, 13 minutes, 11 seconds

Time picture taken	Mon Jul 29 09:58:22 2013
Location picture taken	James S. McDonnell Prologue Room Boeing Building 100 St. Louis, MO