multiple matching sets of original 19th century antique american "jet black" porcelain or baked red clay doorknobs fabricated by or for p. & f. corbin co., new britain, ct. the matching passage door sets contain nicely aged cast brass shanks tightly affixed to the knobs. the steel spindles are original and intact. the passage door knobs were salvaged from a two-flat chicago residence undergoing demolition. priced for the lot.