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yes it is wisconsin and near the mississippi and black rivers. since i found it i have contacted the owner of the the copperculture website and he verified it and made an offer to purchase it, i also contacted the head of the archaeology department at uw-lacrosse who put me in touch with their most knowledgeable person on copper artifacts and she verified it also. no i have not cleaned it anymore than the picture shows, which was to run some water on it to remove the sand. thanks for the interest. i have other stone artifacts i have found walking fields over the years but this is the only copper item i have ever seen. i had gotten the metal detector about 2 weeks prior and was working around in the yard with it. i had found a coin spill in one area, 8-10 pennies, a few dimes and nickles and was working my way a few feet up a slight slope in the yard. i got a solid hit and used the pinpoint feature on the detector. it seemed either good sized or several coins close together. i wasn't exactly sure what i had other than it was copper by the patina and one area of edge that my trowel must have rubbed against, but within a few minutes of thinking about and looking closer i headed for the house and started searching the internet. i never thought i would find such an amazing item.
as for the graduation marks, that kind of threw me also but if you look close they are not exact in there spacing and close to the point they go from a double row to a single row in the center. i can only assume it is decoration or depth penetration marks