Old Electronic Piece Inside Plastic

Hello,

    I found this item in a stotage locker and is wondering what this could be.  I do not have an idea of what it is but what I do know is the stuff surrounding the item is plastic. It looks like a tool for something like a plug-in. Please comment back if you know what it is and what it's worth

                                                                                Thank-you,

                                                                                         ~FamilyUnits1~