I have what I believe is a Crosman 400 Repeater .22 caliber "pellet" gun. From some quick research, I *think* it's the first variant with the cross bolt safety manufactured between 1957 and 1962. The stock has some dings, and the gun needs a cleaning, and probably a valve rebuild kit. It belonged to a family member, but he forgot about the gun long ago, doesn't want it any more, and I hate to just throw it in the trash. Any thoughts on a fair valuation? Thanks in advance for any thoughts!