I am looking at a 336 (I believe) a .35 Remington. serial #G59080. Rifle is clean looks to be older. Says he bought in the early 70's, from original owner (whom since passed away). Doesn't know exact date of manufacture. Has a peep, and a Marbles rear diamond open site and fiber optic front. Also, has original sites (rear open and front). Somewhere? Needs to locate. A good friend of mine. I want to give what the rifle is worth. Any ideas?