Original classroom trade vintage catalog for PENN STEEL INC. Main office was located in Ambler, PA. Manufacturers of Penn-Rite and Aluma-Lite chalkboards for classroom, made of lifetime porcelain steel. Installation details, General specifications provided, also specs for snap-on trim. This unique old 1964 four page architectural brochure would make a marvelous addition to your retro library. Pages are loose and contain a small amount of residual glue on edge