1.25” without backpaper or maker’s name and probably dating from 1915 era. The coiled snake does appear to have rattles at the tip of the tail and it is coiled and posed to strike with extended tongue. Lt. age on the bkg. but only a little noticeable discoloration on the right side. Seemingly some type of fraternal order button but we don’t know the inspiration for the design which in total includes 3 snakes. Hake book Collectible Pin-Back Buttons photo example Insects & Reptiles section #278. Comes with Hake’s COA. Only example we’ve seen.