The Kurz Mausers are pretty rare but that said, seems like the TypeM and S are the most common of them.
Having the claw mounts but no matching rings is quite problematic as far as determining whether it is a "good" deal or not as it could easily cost you as much as the rifle to get proper rings made as well as sourcing a period correct scope - if that is what you want the end result to be.
Without disclosing the price, can you link to the original post so we can take a look at it?