8.5x11" certificate from the "Supermen Of America" club. Certificates were issued between 1939 and 1965, this being the last year of issue, ©1965. This may be the rarest of all varieties of Superman certificates due to lack of participation in the club that was probably due to the strong market for Marvel heroes and Superman's declining popularity in the mid-1960s. Headquarters address refers to "Superman" rather than "Action Comics" which appears on 1939 version. Also, text on this version mentions "Action Comics And Superman" which does not appear on 1939 version. Has individual serial number of "573776." Not only is the certificate without recipient's name and address, it has never been folded. Light corner bumps. Exc./N. Mint. Rarely found unused and in choice condition such as this.