Original old vintage catalog S. H. POMEROY COMPANY, INC. of New York City, NY.  Superior Type Metal Windows.  Manufacturers of Double-Hung Windows in Steel, Bronze, Aluminum.  Model M Hollow Metal is Standard Type.   Disbound from a large 1938 building material construction book, these unique two page technical data specification sheets would display wonderfully matted and framed. It would be a marvelous addition to your architecture and engineering library.