I've seen similar gigantic Lincoln Cent looking discs sold as drink coasters. This one looks similar. Those usually run around 3" or 4" in diameter. It took a while for your first photo to load on my phone. I didn't see the weight when I posted. That thing looks like its bloated - having an allergic reaction to something.
The only thing worth less than a Zincoln -- a counterfeit Zincoln. Unless, of course, it's struck on something other than copper-plated zinc. Let's see the reverse!
and I was first thinking it was one of my muriatic acid specials. special coins put back in circulation for collectors
More likely pot metal. That would be the cheapest thing to cast and then plate, I think -- and this one screams "cheap".