complete interior residential early 20th century passage door antique american stamped steel metal "como" pattern doorknob backplates, knobs and mortise lock designed and manufactured by the p. & f. corbin co., new britain, ct. the stamped wrought steel hardware retains the original highly desirable oxidized copper-plated finish. each wrought brass thimble is tightly affixed to the backside of the escutcheon. the mortise lock is fully functional. several sets available. the "como" knobs and backplates were salvaged from a chicago wood-frame residence built around 1910. the p. & f. corbin hardware company originated in 1849 when brothers philip and frank corbin and edward doen established the firm of doen, corbin & co. in new britain, ct. at this point in their infancy they solely manufactured ox balls. shortly after, in 1851, the company's name changed to the p. & f. corbin company. by 1868 corbin's catalog of builders' hardware was greatly expanded and the hardware company saw rapid growth thereafter. by the beginning of the 20th century, corbin was one of the leading hardware manufacturers in the world. priced for the lot. the backplates measure 2.5 x 7.75 inches. mortise measures 5 1/4 across the face x 3 1/4 in depth.