Antique Cast Iron Interior Mortise Lock Box 5.25" Faceplate Skeleton Key SalvageAntique Cast Iron Interior Mortise Lock Box 5. 25" Faceplate Skeleton Key Salvage Description Add period accurate functionality back to your historic home with this 5 piece lot of original antique interior door mortise lock boxes. Built to last from durable heavy cast iron, these recessed mechanisms are authentic architectural salvage pieces from the late 19th or early 20th century. This bundle is ideal for restoration projects, complete house