WOW!!! Those are so cool being on them bars like that, I never seen that....
I believe them are what they call " Chinese Cash Coins ".
Here's a link to one site about them: http://www.lotn.org/~calkinsc/coins/doc/chinesecash.html
I have found a few, and have seen a few here on the forum, but haven't seen anything like what you have there...
I don't think ya got hurt for $2, even if ya just hang'em on the wall...