worth zero in my opinion. it's common, it's not a precious metal, and it's corroded. anyone who might want one for any kind of foreign coin collection can easily obtain one in better condition for probably less than a quarter
I've got one just like it that was found in a Union camp in VA that we have hunted to death. Lost by a kid probably. I thought it was play money at first. You never know what will pop up. Better than a nail any day!