Looks more like a Springfield than a Mauser, although Springfield is a Mauser clone. And, with Springfields, check the serial number to make sure it's a later one, not in the improper heat treatment range.
Does it have the military trigger? I'd want a Timeny, etc. which would add around a hundred bucks, maybe less if you shop a bit. Ebay often has good prices. Looks like it has the safety conversion for scopes. Was the original bolt handle ground like that or is it a welded on aftermarket handle? Hard to tell from the photos.
If the barrel is slick and everything seems Kosher, I'd think it may be worth $500 or so. Of course, I'd try to get it for less. Is that barrel SS or just polished bright and is the Flaig name stamped on it?
DF