If the base wasn't notched (or stemmed) viewing this as a Cobbs Knife from the Early Archaic would be entirely correct; bevel sharpening is how a Cobbs SHOULD be sharpened, but Lost Lakes and Dovetails were what Cobbs were converted into--if they (Cobbs) were to be made anything other than a knife. Was the stem added by a later culture? If so it was done at nearly the same date (7500 BP) as when the Cobbs was made--study the patina, you'll not find enough difference to matter (between stem and blade). The piece came out of a Grafton, Illinois, collection, near the confluence of the Illinois and Mississippi Rivers--length is excellent at 4" and a half-sixteenth. Width is 1&5/8" with 3/8" max thickness near the base. One note on the base: the snap stem is heavily ground. The chert is heavy on fossils, not a Harrodsburg, but something similar--tap it against another piece of flint and it'll have a "tink tink" sound only extra hard flint produces. Where I display the piece is with my Cobbs Knives as that's what the blade is--the base, that I can't explain. Pardon if my description here is rambling, but when you encounter an authentic point that defies experience you try to make sense of it. Shipping is $6.00, checks or M.O>s are welcomed. Sorry, I do not use paypal on my store--Roy A.