You are bidding on an original NOS “Winker” modular plug. I recently acquired a batch of these that were brand new in the box. They were discontinued many years ago. They are used on anything that you would like to have a flashing bulb. These were available for purchase to vendors that purchased hot nut vending machines like the Ajax Triple hot nut, Silver King hot nut, Regal hot nut, Maybey hot nut, Metcraft hot nut, Asco hot nut and many other machines that used a light bulb to either warm the nuts or attract customers. Limited quantity available. Good Luck!