Original bronze back plate in exceptional condition with dark even finish. There are no scrapes or signs of ever having a key cover but I am guessing it did. Found an old round headed tack with matching patina that covers the small hole perfectly where there was most likely a key cover as price reflects.
Measures 7-1/4”x 2-3/4”x1/8” Distance from center of knob socket to center of keyhole is 3” Has a ¾” socket