Hello all... first time posting, just got a rather odd coin and trying to find out what it is.
This ...whatever it is... is a very large and heavy coin-like item. Can't figure out what it's made of, but my Pitney Bowes postal scale says it's 2.8oz. That's probably +/- 0.1oz or so...
No year, no denomination on this, not even sure it's actual coinage. Up until I looked really closely at it, I thought it was terra cotta

but then I looked at it under a desk lamp, with a magnifying glass, and a certain metallic sheen was noticed. It's so corroded/rusty/etc. though, that (as said above) I can't tell what it's made of without damaging it.
If it matters, this was in a large collection of my grandfather's (~39lbs (+/- 2lbs) of coinage, including boxes, according to my bathroom scale). I'm selling it (
not here) because I need the money. It's sad to part with what is essentially my grandfather's legacy, but I have no other choice.
Images are attached.
Thanks (somewhat in advance) for your help, folks!