Unknown - some type of early hammer or.....?

by Steve
(Minnesota)

Found this while metal detecting an old habitation dating back to 1700's with continued habitation to current times. Many early fur trade items have been found close by, but I do not think this dates any earlier than 1880, since it does not appear to be hand forged. Roots have grown thru the oval eye and around the piece. Thought that was neat so cut the roots and left them in place while digging it out. Several of us are puzzled by what this is so any help would be most appreciated.