Design patent #D4,107, June 7, 1870 by Charles Kunze.  Assigned to Metallic Compression Casting Co. assignor to Russell & Erwin. Compare withC-10100. One of several designs patented on June 7, 1870. Pictured are knobs marked MADE BY METALLIC COMPRESSION CASTING CO. BOSTON and on the later knob MNF'D BY METALLIC COMPRESSION CASTING CO.  BOSTON and R. & E. MFG. CO. SOLE AGENTS. Click on each photo below to view additional images and information