Mark,
you have had some true experts comment above so I can/will not repeat anything that they said. But I tried to look at the proof mark on the side of the stock which would be just below the four screw holes for the top holster strap. There seems to be something there that could be a proof mark. I really couldn't tell from the picture. If that a true proof mark, then this would tell you that this was probably an original stock at one time.
Big Norm
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