original and intact antique american interior residential passage door oval-shaped doorknob backplate likely fabricated by reading, sargent or possibly p. & f. corbin. the ornamental stamped bronze metal backplates contains a beaded border with anthemions above and below the opposed screw holes. the wrought brass collar or thimble is fastened tightly to the backside of the escutcheon. measures approximately 7 x 2 1/2 inches.