The front of this photograph states, "National Lock Co. Addition. Security Building Co. Contractors, Rockford. Weiss and Niestadt Architects, Chicago. Work started March 1, 1925. Picture taken 4/24/25." The plant's main structure at 7th St. and 18th…
Construction of National Lock Company's Building #6. Built by Security Building Company Contractors of Rockford, Illinois and designed by Weiss and Niestadt Architects of Chicago. Work Started March 1, 1925.