This is a vintage loose coupler. Has two slider rods for inside coil. Also has coil slide selector bar that slides. It also as four vintage binder post. A rotor selector is used for additional tuning on the inside slide coil. A vintage detector is not included but I will include a germanium detector with this sale. Most likely this was homemade or from kit instructions during WWI when radio receivers were limited mainly for government use. Appears to be complete but untested. sold as is.