It looks , in your photo , that someone took a triangular file and filed away the metal over the top of the peep hole , turning it into a "V" . I could be wrong , but that's what I see. If the underside of your bolt root has only a "R" and a punch mark "." , that is ok. The "42" mark is very limited around that time period. Both of my Jan. rifles have it , so I thought yours might. Often times it appears as a squarish smudge mark. I didn't know mine had them till a member here educated me on them.
Chris
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