100th Anniversary American Institute of Architects, 1857-1957 Block of Stamps

First Day of Issue "OCTAGON" WASHINGTON, D. C. 100% Anniversary AMERICAN INSTITUTE ARCHITECTS 1857-1957 Art Craft CENTENNIAL BO FFR 23 9-AM 413N INSTITUTE OF ARCHITECTS 1957 N.Y. ССССССС 1SSENTENNIAL INSTITUTE OF ARCHITECTS 1957 CENTENNIAL 34 UNITE FIRST DAY OF 193UE CENTENNIAL 3¢ INSTITUTE OF ARCHITECTS 1957 INSTITUTE OF ARCHITECTS 1957 3¢ UNITED STATES POSTAGE