bolt has been heavily polished & made serial number illegible, hardness impression in bottom bolt root with what appears to be an "X", top of bolt root has a "5" still visible.
reversed safety flag.
S in cutoff recess of stock. no grasping finger grooves.
It is in a "nest" of NM rifles and your rifle may have been not sold after National Matches - no match in sales records. Pictures would help.
People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf.