I am in Michigan, 11 thousand and three lakes and I have been looking for an old anchor like that for YEARS. You find one in the middle of the states?? LOL fantastic find I say. I found the flukes off of one that was broke and a lot heavier and I found a three ton anchor and had to leave it BUT I have yet to find an old one like you have. I have had over 100 anchors beside my house and i am jealous!!
There are ways to clean it and then put a layer of melted paraffin wax on it to keep it away from air. Sweet find!!