Buck,

One can see that is not the original pad. There are wood plug repairs in the stock where the buttplate screws go in.

For what it's worth, replacement of the pad will not affect the originality of your rifle.

The existing pad was quite well done, as you have observed. A replacement, if necessary, can be equally well done.

Curl

P.S. Beware that the pad may be glued onto the stock in addition to the screw attachment.