Anschutz 22 long shot gun

I could use some help in determining what my gun is worth. I have a 5 shot ,clip fed, bolt action 22 long shot gun. It was made by J.G. Anschuts G m b h Waffenfabrik Ulm/germany. The action is groved for a tipoff mount, but no rear sight. The barrel has a bead sight,and the back half is smooth bore, with the front half bored out to app 40 cal. On top of the barrel is stamped, Stoeger Arms Corporation New York. Between this and the action in big letters is ZEPHYR with two circles around it. On the side of the barrel is 22 long shot. There is some crest or proof marks on the barrel and action. I have owned this gun since the mid 70's, but have been unable to find when it was imported, or what it could be worth.