B63-489. INTERCHANGEABLE SCREWDRIVER SET. Clark Patent. Patented in 1873 by Frank Clark and manufactured by R.H. Brown & Co. of Westville, CT. Set includes the handle and four blades in original wooden box with 95% complete paper label in lid. Handle has some minor scratches, blades are near fine with some small rust patches, box is intact with good hinges but broken latch. From the collection of Pat Gefre. Good+ 80-150