Harsco Corporation, founded in 1853 under the name Harrisburg Car Manufacturing Company, is one of the rare American industrial companies to have survived more than a century and a half of economic transformations. This certificate for 100 shares, issued in 1964, dates from a period when Harsco operated mainly in services to steel mills, slag recovery, and maintenance of steelmaking facilities — an activity that would go on to become a precursor model for industrial environmental services. Still listed on the stock exchange today and specializing in environmental technologies for metallurgy, Harsco offers the unique interest of a scripophily company that remains active. This document illustrates the remarkable continuity of an American industrial company through the economic transformations of the 20th century