Made of cast brass. The knob was made by Enoch Robinson in the 1875 catalog. It is part of the E-15410 group. Art Nouveau style. The plate was made by Yale & Towne. Good condition with appropriate wear from age. Priced as one door knob and one back plate. The dimensions are Knob 2.25 in. diameter x 2.375 in. D, plate 9 in. H x 2.25 in. W x 0.375 in. D, drop 2.5 in., collar 0.625 in. diameter.