I suppose it boils down to “it’s worth what someone is willing to pay for it”.
I didn’t advertise mine, I answered a wanted ad on here and named the price I wanted. The buyer was happy with that price and was very happy with the pistol when he received it but he may have paid a bit more for all I know.
Anyway, it gives you a guide.
Incidentally, mine wasn’t cased, it was just in the original genuine Russian cardboard box.
Eric.