2-1/8" c. 1930s. By Phila. Badge with tin-covered reverse with bar pin. On reverse at top is large 1.5" cello split along metal back. Doesn't hurt front view much except tiny 1/16" hairline split at 11 o'clock on rim. Hake Book Collectible Pin-Back Buttons photo example Sodas Section #319. Comes with Hake's COA. Serious damage but displays Exc. and Scarce.