There is also an item which holds a napkin or serviette in a button hole or the top of a conventional necktie knot. It is conjectured as a clamp for the corner of a napkin and an hook which hooks into the top of the tie knot. They are most usually in sterling silver and date back to at least Edwardian times. Hence often to be found in antique outlets as functional collectors items. Certain "gentleman's clubs" include a button hole in a corner of their napkins for direct coupling to an upper shirt button.