I have a copper hatchet from upper Michigan from the copper culture people approximately 4500 to 6500 years old and a spear point thats a little older. Both have heavy green patina. Also ceremonial or burial disc about the size of a baseball made of lead that is a few hundred years old. For some reason I cant get the pictures on here. I can send them to you upon request. I am looking for a under water detector. Must be a good one. LLet me know what you have and I can send you the pictures. I have bought and sold detectors on this forum many times. Any questions just e-mail me. Thanks for looking.