I just purchased a 30/30. Based on serial number=(WR60, etc.) It was mfg. in 1963. I thought the cross bolt safety was added after that date. I'm not sure when it was added I just thought it was later. Since mine gas the CBS does that affect the valve? It's in pretty decent shape. A little rust & some dings on the stock. After my gunsmith gives it a once over for mechanical issues I'm thinking of re-blueing the barrel & refinishing the stock. Would that hurt the value? I want it to look good. It's a Christmas present for my son.