Found an old Mauser at a local shop. No serial number, no caliber marked, the bore measures .323 to .325 and it will nicely chamber 8x57 Mauser rounds so I am assuming that is what it is. Has a double set trigger with an adjustment screw. Lots of engraving but nothing particularly spectacular. Has a rib all along the top of the barrel and a leaf rear sight with an additional flip up one for longer range, but no markings. What can you tell me about it and what is it worth?