Original metal trade vintage catalog for AMERICAN MAST & SPAR CORPORATION. Main office and factory was located at East 149th Street and East River, New York City, NY. Manufacturers of Metal Flag Poles, Yacht and Derrick Masts, Spars and Booms. Made of copper bearing steel, aluminum, bronze and stainless. Umbrella Revolving Ball Bearing Truck No. 30 is shown. Unbound from a large 1941 engineering catalog, this unique old one page technical brochure would display beautifully matted and framed. A fantastic addition to your retro metal library.