My Benjamin Franklin, so stamped on the left side of the receiver, was a gift from a friend of my Dad's. It was given to him by his dad. I got it in the late 50's.
This one is a model 312. I have not taken the time to research it.
Many years ago I sent it in for repair because it was loosing pressure. It was returned to me fixed, with extra work done, at no charge.
mkee. Another link? Do you have an old H&R 410?