It might be Czech, but better information is needed to be sure. Since 7x57 was one of the common calibers for commercial military Mausers, I would have no reason to doubt the seller on that score. It looks like a nice rifle.
It looks like the VZ-24, 7mm, south american contract rifles the CZ made in limited numbers. That one is in better shape than the ones I've seen lately. I've seen them between $150 and $250.
It does look similar to a VZ-24. It has a turned down bolt handle and the stock is cutout for the bolt handle, though. Also, it appears to have a shorter barrel than the VZ-24.
