Post 64. I believe it was made in the 80s. I bought it about 10 or 12 years ago and it has been my favorite rifle. The previous owner had a scope on it so there's a flat mounting plate on the side. I tried once to remove it but the screws that held it are too long. Been meaning to take care of it but life's priorities always interfere. Am I using the right term for these screws and where can I order some?