original and highly desirable 19th century antique american art nouveau style ornamental cast brass "empire" pattern doorknob backplate fabricated by the p. & f. corbin co., new britain, ct. the unique doorknob backplate features intricately designed foliated scrollwork or leafage in pierced metal fashion. the unusual, oversized thible or collar is radially fluted. contains four mounting screw holes and a single skeleton keyhole. measures approximately 10 1/8 x 2 3/8 inches.