I have a Mauser, that is stamped Standard Modell on the receiver, that is 8mm. All the parts are stamped with the same last numbers. On the left side there is 4 diffrent little stamps of crowns, with B, G, U, and N under them. It has an adjustable rear sight. I got it from my Grandpa when he passed away, which was along time ago. I was wandering if anyone could tell me approx. year, and if this was infact a WWI gun. It is I think all original, except I kinda remember him saying he changed the stock. Any ideas on approx price also? Thanks...-Joshua