6 fold Romanesque style door knob set made by Corbin in the 1905 catalog. It is part of the J-30600 Fulda group. Priced as one door knob and back plate. The dimensions are Knob 2.5 in. diameter x 2.5 in. D, plate 7.375 in. H x 2.5 in. W x 0.375 in. D, collar 0.75 in. diameter.