One big, big piece of flint, so much patina I'm going to stick with "tan chert" as the flint identification; length is close to 5&9/16" by 1&7/16", the thick medial ridge reaching 11/16" max thickness. The piece is out of a S.W. Indiana collection, could be an Indiana find or a Kentucky creek find, it wasn't marked to tell us--authenticity is no brainer, whichever creek produced the find. Features: the chisel end shows strong use polish to the thinner end, flint took on a polish (see the close up, you can see the gloss from use as a chisel) Next is the serrated edge. That sort of serration is very unusual on a hand held tool, big "key hole' type notches. Too, there is an indented shaft scraper (or bone scraper) on the top edge--really a multi-purpose tool. One specific feature I've been experimenting to understand--HOW did they hold the piece--obviously you don't want to be gripping the serrated edge, so how'd the piece fit their hand? And which hand, generally you could tell if the user was right (or correct) handed. I haven't worked that one out--experiment, you may be the one to figure how the tool was used. One small note--on the chisel end, away from the serration, there is a deliberately ground-smooth finger tip hold--I think it's a reasonable guess that that one spot tells us at least one of the ways the serration was used. One fascination artifact, I think, real in every detail. Shipping is $9.00 due to the weight, checks or money orders are the only way to pay for the piece. Sorry, I do not ues paypal-type services--Roy A.