Pogybait,
The value of your rifle is whatever you can get for it, so sporters are very difficult to price, but those old 4x sniper scopes are generally going for 300 to 600 on ebay. The fact that the claw mounts mate to your receiver is a plus, that's rather rare for rifles of that era.
Because it is in good condition, and because the action is in period correct configuration for a sniper rifle, someone wanting a sniper rifle would just have to get a milsurp stock and barrel to make it period correct if not original. So there would be interest from that sort of buyer.
Because the action hasn't been scrubbed, and there are no import marks, that also raises the value a bit.
But because it was sported, that actually lowers the value a tad, people buy rifles not stories. I wouldn't sell it myself, but if I had to build a rifle in the same configuration I'm looking at (back of the napkin math here) 200 dollars for an action, 100 for a decent barrel, 100 for the stock, 100 to 200 for claw mounts, and 300 or so for the scope. Not including any labor for aftermarket iron sights that's 800 to 1,000 just in parts. I doubt you'd get that at auction unless you found someone who just loves old Mauser sporters.
Jimro