Seller: bryce041 (1,675) 100%, Location: Madison, Mississippi, Ships to: US & many other countries, Item: 251853538065 Condition: Very Nice Set of Knobs and backplates, Details: Antique Eastlake Era Door Knob Set With Backplates Sold as a set have no idea what these knobs and plates are made of I cant tell if the knobs are brass with a copper finish or made of some other materialI can definitely tell that the rosettes are made of a non metal material, Ive never seen anything like these so any iformation would be helpfulThey are however a beautiful set Really nice The design was patented by William Gorman and assigned to Russell & Erwin Mfg. Co. (D3732) on Nov.2, 1869. It was shown in the 1875 Russell & Erwin catalog as made of "Lava". The composition of the material has never been clearly defined. The general feeling is that is made of very fine wood particles and shellac. You can find more information on antique hardware at www.antiquedoorknobs.org. FREE! Sellers: Add a FREE map to your listings. FREE!