Knowing my interest in primitive archery, my boss brought this in for me to see. It is a point his mother found near the Flint River in Michigan. Admittedly, I know little about stone points. It appears to be from chert, from what little I know. It was found eighty-two years ago. Surprisingly, it is still relatively sharp. The "blemish" appears to be a quartz deposit in the stone. Almost looks metallic. Without a magnifying glass, it's tough to tell. Hope ya'll enjoy...