I picked up a package deal of a bunch of vintage and custom gun parts a couple years back and finally have time to go through it. I came across a Marble Goss Sight "Marble S" in it and not sure what it fits. It's in serviceable condition but not sure of the value to place on it. The sight is missing the aperture but they seen available. eBay has crazy prices and I don't trust them, just want to give someone a good deal and would like to know what rifle it will fit.