c. 1890's original ornamental cast iron interior residential art nouveau style "columbian" pattern passage size doorknob design and fabricated by the reading hardware co., reading, pa. the antique american doorknob has been lightly cleaned to bolster the unique design motifs. the banded rim doorknob was salvaged from a chicago greystone residence undergoing demolition. measures approximately 2 1/4 inches in diameter. two available.