Original vintage photogravure of H.K. Porter. Chairman, Manufacturers Division, The American Mining Congress. Hyatt Roller Bearing Company.  Old 1928 photogravure print. Would look sensational matted and framed.

A Photogravure is an intaglio printmaking or photo-mechanical process whereby a copper plate is coated with a light-sensitive gelatin tissue which had been exposed to a film positive, and then etched, resulting in a high quality intaglio print that can reproduce the detail and continuous tones of a photograph. - Wikipedia.