ANTIQUE ART NOUVEAU DOORKNOB PAIR SET YALE OLYMPIAN w/ Backplates 1905. Condition: These have toning, the cylinder is rusted, but the center turns, one knob does not come off. Please see all photos they are an integral part of this description. The condition is typical for this type of antique and its age. Company Marks: Both backplates are marked Olympian, but the smaller backplate is hard to read. Material: Uncertain what these are made out of. Offers: Reasonable offers are welcome and accepted. Thank you for your consideration.