Not sure, but I don't believe that is a factory stock either. Looks to be influenced by the CA Weatherby school of design.
That being said I rarely base my purchases on absolute originality or "collector's value". If it is a good shooter, metal and mechanics in good shape and the seller and I are happy with the price it's "all good".
I've restocked or redesigned/refinished stocks that I wasn't happy with on barreled actions that were great buys and come up with some of my favorite guns.
So how does it work on the range???
Mike J