There's no computer software behind this hardware. Every knob, hook, hinge and handle is custom made by hand at P.E. Guerin, a foundry located in Manhattan's Greenwich Village.

Established in 1857 by French immigrant Pierre Emmanuel Guerin, the company specializes in ornate 18th-century French and English hardware, including items such as door knockers, cabinet-door pulls and sink basins. The firm remains a family owned business and is run by Mr. Guerin's great grandnephew, Andrew F. Ward. Today, most of the orders they fill...