This is a sweet little domed pin made of root beer bakelite with a brass star center. I found this among a button collection so it may have been a button at one time. It measures 13/16" in diameter which is a tad under 7/8". The height is 1/2". It is stamped on the pin mount Pat. No. 23244. The pin mechanism is attached by a rivet so it spins. There is a tiny hole in the star.