2-3/8x3-5/8" single-sided membership card issued by Denver, CO. radio station KVOD. Club was for listeners of the 1940-1951 program "The Adventures Of Superman," this card being from the earliest years of the show. Card features nice Superman portrait and text reads "This Certifies That (child's inked name) Is A Member In Good Standing Of Republic's Superman Club And Having Complied With All Rules And Regulations Is Entitled To All The Privileges Thereof." Card shows obvious handling wear and has small 1/8" hole at upper right. Good. Rare and first we've seen in our 48 years.