The Simplex Whistling Copper Tea Kettle is a vintage collectible made in England with a patent number of 400709-402190. It is suitable for use on both electric and gas stoves, featuring a classic copper design with a whistling function for indicating when the water is boiling. This original piece from the Simplex brand adds a touch of nostalgia to any kitchen with its antique charm and distinctive features.I have put water in and has the whistling sound.as I found in nice shape for age selling as is no dings,dents or leaks lid is a little out of shape fits snug.