Each year since 1955, Springfield Armory had rebuilt a number of Service pistols to provide Match-grade pistols for competitors and students at the National Matches. Some National Match pistols were sold by the Director of Civilian Marksmanship after the matches.
We believe that this pistol was assembled in 1959, but it's possible that it could have been a 1960 assembled pistol. Note the uniquely marked "COLT'S PT. F.A. MFG. CO." marked barrel and the black plastic trigger.
This particular pistol is a National Match pistol produced by Springfield Armory for use in the Camp Perry National Matches. According to Springfield Armory records only 1065 pistols were produced in 1959 and only 9 were sold to civilians through the DCM.