Each set includes two knobs with their connecting spindle and set screws, two rosettes, and a pair of two-part keyhole covers (enough hardware for one door.) The door hardware is in good condition with the expected wear including cracks near the set screw holes in the knobs (as pictured) as well as very worn finishes on the rosettes and keyhole covers (as pictured.) doorknobs measure 2â€ in diameter and 2-3/8″ deep; the rosettes measure 2-1/4″ in diameter, and the keyholes measure 2-1/8″ tall and 13/16″ wide. THE PRICE LISTED IS FOR EACH SET. Hard-to-find antique hardware sets from Russell and Erwin’s Lava Line in theÂ “Gothic” pattern. They are featured in the 1876 hardware catalog and marked with patent dates of October 19, 1869 and November 2, 1869. They are made of gutta percha (a mixture of resins from Malaysian trees) which was one of the first plastics used for manufacture of items such as daguerreotype cases, picture frames and doorknobs in the late nineteenth century. These sets are incredibly rare and very few of them are in existence today.