group of all original and intact c. 1870's ornamental cast bronze interior residential antique american victorian era doorknob backplates or rosettes designed and fabricated by the russell & erwin mfg. co., new britain, ct. the decorative metal backplates or escutcheons contain a mostly uniform surface patina. the salvaged chicago door rosettes are triangular in shape with three screw holes surrounding the centrally located thimble. priced for the lot of four.