19th century american eastlake style ornamental cast bronze "screwless" spindle doorknob backplate or escutcheon featuring abstract floral motifs. the passage door backplate was fabricated by the chicago hardware co., chicago, il. the backplate was designed specifically to accommodate the niles "screwless spindle" doorknobs. the oversized collar or thimble was designed for extended doorknob shanks. the backplate was often paired with "jet" black porcelain doorknobs. measures approximately 5 3/4 x 1 3/4 inches.