Antique 1878 Brass Door Bell for Pull Lever

Nickel plated brass bell is about 4¾" in diameter, cast iron mount is about 5" x 6-3/8". 2 mounting holes which are 5½" center to center. Patent date on back: Feb. 25th 1878. Some very light wear to plating. Original black paint on cast iron mount has some wear and paint chips. Light surface rust to internal parts. Chromed plated finial nut is rusty. Bell rings nicely and mechanism works well. No lever. Any questions just ask.