Here are two large coat buttons. The one is made of celluloid with a metal backing and the other one is some type of plastic similar to bakelite. The celluloid button measures 1 3/4" in diameter and the other one is 1 5/8" in diameter. The plastic one has a hairline crack on the back that goes around to the front. The celluloid button has rust on the back and a tiny crack on the front edge.
Two Vintage Large Plastic Coat Buttons