Fake Copper US Trade Dollar?

[AmazingWetBread 0]

I recently uncovered this trade dollar, S, 1876 from my dad. But, I noticed something weird, it was made of copper! Any information on this??

[thedeadpoint 0]

Oooooh.... 

I googled it. I couldn't find any references to a legitimate copper trade dollar. Looks like it's probably a fake. I think this coin was faked a lot since it circulated so widely.