B68-56 INTERCHANGEABLE BLADE SCREWDRIVER SET IOB. R.H. Brown & Co. Patented wood handle and spring chuck marked "The Acme Automatic Screw Machine, National Acme Mfg. Co., Cleveland, OH" plus four bits, inside original 8" x 3-1/4" wooden box, with label inside lid for "Clark's Best Quality Screwdrivers with Patent Handle," stained but intact. The Clark referred to was Frank Clark, who developed the interchangeable handle from an 1873 patent for a dentist's drill. Wear and staining on wooden handle and paint splotches. Metal oxidized but no pitting. From the collection of Jim and Christa Schoenky. Good 60-120