Here is a lovely dark brown Bakelite button with a white metal escutcheon depicting a deer in amongst the pine trees. I think it is really nice. It measures a little over 4 cm.
BAKELITE AND METAL BUTTON
CELLULOID BACKS
Here are two Celluloid Back buttons using a fawn coloured Celluloid. One has a decorative metal border and the other a delicate floral design in metal. They are both very effective.