Celluloid, being one of the first plastics produced was popular from the late 1800’s right up til the 1930’s. As it was highly flammable, it was then replaced with various other synthetic plastics. These three buttons are all large, being approx. 5 to 6 cms in diameter. They are all tin backs with a metal loop shank. They are also all in a shade of brown which was a common colour of the early 20th Century.