Decades back, I added this big blade to my Cobbs Knife frame--it came with a "You've got to be kidding me" story. A friend knew of the piece for some time, wanted it, but it's location was, well...secure: cemented into a sidewalk's steps. Somehow or other he convinced the homeowner to allow him to chisel the blade from it's moorings--he got almost to the tip before a break occurred, the tip broke--or the chisel slipped. He didn't gather up all the tiny fragments of flint, or at least he didn't try to glue them back into the break--just glued the tip back on. Has it been 25 years--thirty years? I've long since forgotten. Whether it's an Illinois Cobden Flint or an Indiana Hornstone I can't say for certain, but that's one great bullseye in any case. Length is 5&13/16" by 2", yet the THICKNESS is only 3/8" at the single thickest spot--much of the blade is 5/16"--the work of a flint "artist" in what's now Lawrence County, Illinois. All the best on this hot, humid August day--Roy A.