AsJim said, oil it to stop the rust. Otherwise looks to be in pretty good shape. Please take a picgture of the markings on the receiver opposite the bolt. If your floor tiles are 12", your gun appears to be the short rifle--long rifles are 50 plus inches long and are rare. Check that the numbers are matching--even the dust shroud will have a number on it. With matching numbers, an intact mum, and in the condition it is in, I'd put the value at $400-$450. FYI--the stocks on many of these guns were cut so they would fit in a duffle bag--the cut would be hidden underneath the barrel band that has the front sling swivel.