Very nice little Mauser.
It looks like a really well done Hobbyist stock that MIGHT have been checkered as piecework by an outfit like Ahlmans in MN, The checkering pattern looks like their work.
Another thing that makes me think this was a low budget piecework job is that practically NOBODY who is invests in a complete rifle build by a name smith would ever use such a fencepost plain piece of wood. It was likely a semi inlet piece of English Walnut from Richards etc that was well fitted and finished by it's owner (and/or local smith) and then sent off to some outfit for checkering,
As it stands, that is a relatively rare gun in our present day, A rifle that is better made and more graceful than 99 % of the factory hunting rifles currently made but yet not so rare and valuable you cannot "use it like you stole it".
It should be a heck of a little hunting rifle.