Antique rotary or twist door bell in brass, circa 1900. Mounts directly through an exterior door with the turn handle on the outside and the bell mounted inside. Bell turn is on rectangular beveled edge plate which measures 3 3/4" high by 1 3.4" in heavy wrought brass and the turn extends 1" and is 1 3/4" across. Mechanical rotary bell is brass cover on a cast iron base and is 3 1/2" in diameter. Bell rings with a continuous ring as long as the handle is turned and can be heard throughout the house. Complete, polished to original look, and restored to working order, bell is adjustable to any door thickness.