Here are some other Carey Ohio Porcelain Co. pieces I have. The two large telephone knobs and one split nail knob are marked C.O.P. While the smaller telephone spool is marked C.O.P./S and the other split nail knob marked Carey/Ohio. Elton Gish has lots of interesting knobs, cleats and info on his website. Anyone interested in these items should definaly visit it. You will be impressed.