c. 1900-10 original antique american ornamental cast iron interior residential oval-shaped doorknob backplate featuring embossed intertwining leafage. the antique doorknob backplate is attributed to the reading hardware co., reading, pa. contains a single keyhole opening, protruding collar or thimble and two screw holes for mounting flush against the interior door. measures approximately 7 x 2 1/4 inches.