Sadly, it’s not a pre 64. It is a “classic” model made in the 1990s. It’s is a controlled round feed, however. I am going to put a fiberglass stock on it so it can handle any weather.Congratulations , Master Smith ! You have read all of my articles and so
you know exactly how I feel about the pre 64 Winchester Model 70 , chambered in .375 Holland & Holland magnum. You cannot do much better than the " rifleman's rifle " . Sturdy , robust , accurate and beautiful piece of classic American craftsmanship. Have you considered using a super grade stock on it ? Also , be sure to check the feed rails on your rifle. Some of the pre 64 Winchester Model 70 bolt rifles which l have seen in my career needed to have some work done to them , in order to get them to feed 300 grain soft point cartridges reliably .