Glue 2 together for a week then pry them apart
the one the glue sticks to will sometimes look like it has a double image
since elmers drys clear.
of course fire will melt it off, it can sometimes look surprisingly real.
Jeff, now that you mention it, I looked closer at the coin and it has a tiny tiny bit of clear glue left on the coin. I'm still going to keep though because it looks cool. haha