Well now, these assorted knife blades are from several distant and distinct eras. All of them came from the same site and exhibit varying degrees of wear. Several of these blades are so worn from use and resharpening that they resemble dart points and may have, in their final sequence, been used as such. A knife blade, with continuous use over a period of time, could conceivably lose 3/4 of its original length and 2/3 of its original width.