I need to know a reasonable value for an old Weaver pistol scope. It is a 4x, stainless scope. It is stamped on the top "WEAVER STAINLESS P4S USA" followed by a serial number. On the side of the adjustment turret it says "Micro Trac". Also, where might I be able have this scope worked on? I will try to contact Weaver, but I don't know if they'll service this thing.