lot of five matching original antique american interior residential cast brass passage door escutcheons or backplates likely fabricated by the p. & f. corbin co., new britain, ct. the group of unornamented backplates each contain a single skeleton keyhole, protruding thimble or collar and two screw holes for mounting purposes. mostly uniform surface patina throughout. priced for the lot. measures 5 1/2 x 1 1/2 inches.