Look at the left side of the bolt sleeve, right behind the part of the handle that attaches to the bolt. In your picture I do not see one. The bolt does not have to be removed to see it. You may have a transitional gun. The pin was eventually done away with. I don't think your gun was made in the 60's. Still thinking '72 or '73.

Maybe someone can give more info. What shade is the stock color, redish? That was post '72 also.

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