WINCHESTER ACCESSORIES NO FURTHER A MYSTERY

I’m in a small town 40min South of Denver, CO. I joined largely to find out more details on my father’s 1959 Product 70 .three hundred H&H Magnum. I don’t hunt, so I’ve only taken it target shooting to this point.I however have not experienced it on the range. This is certainly on my short-term to try and do record. It's a Lyman peep sight