1.5" with covered tin back naming maker St. Louis Button Co. About 4% of back has trivial surface oxidation. Reverse has fixed vertical pin. Front shows large black cat standing on a tin roof against a star studded blue sky and a yellow arch representing a crescent moon. Text is "Flintkote Roofing/Flintkote Folks." Two 1/16" air dots as made on cat's back just seen in reflected light.  Great graphics, scarce and Exc. Earliest version, see next item.