refinished c. 1880's antique american doorknob escutcheon made specifically to accommodate the niles "screwless spindle" doorknobs. fabricated by the chicago hardware co., chicago, il. intact fluted doorknob shank thimble or collar. this type of backplate is often found with black porcelain doorknobs containing the specially made cast iron spindle. commonly found in the chicago area. unique size. comprised of cast iron. measures approximately 4 1/8 x 1 7/8 inches.