Springfield Armory* became a civilian venture when the name was purchased and the production of rifles began. The date is about 1974. Anyway, they proceeded to make M1s like yours and the numbers were up in the 7 millions. This confused some people that thought there were considerably less M1s manufactured. They were correct. The rifles manufactured were of an excellent standard as far as I know and a friend of mine has one. His is all military parts of all manufactures including a D28290 trigger mech with small hole and no revision numbers. (Early) I know, I found it and installed it for him. They also make M1As and handguns. Yours has the * after the Springfield Armory so it's one of these. I think it's actually an R in a circle but I can't make that on here.