Antique Solid Brass Doorbell Button

Description

You are Bidding on a Vintage Cast Solid Brass Doorbell Button. The back plate diameter is 1 1/2 inches. The bell treads together. The button is a black plastic or Bakelite.
There are no markings on the bell. I purchased it in a Newport, Rhode Island auction. I also have one that measures 1 1/4"  with no back plate.