1.5" with silvered luster tin back made with no pin. Front displays as a standard celluloid button with additional text reading "Sing, America, Sing/Starring Venida Jones/KMOX St. Louis, Mo. Every Sat. 9:30 P.M." Jones was a singing favorite over this powerful station which was heard by distant listeners, even ships at sea. She was also on the Columbia radio network as an organist in the 1930s. NM displaying Mint and the only example we've seen.