It's worth what someone will give you for it, or what you will turn down. It was certainly a very good thing in its time, but in our time similar or better performance can be had at widely affordable prices. I might eventually put something like that on a rifle I intend to configure as a target rifle, not for competition, just range practice for myself. If I were trying to buy one now (I'm not) I think I'd be happy to get it for $200, but not at all certain I could. I bought one some years ago because the seller insisted on getting rid of it when I wanted to buy something else. I traded it to a friend at a value of about $100, don't think I lost any value at that.
