Roman coin???

[CHughes77]

This is a coin a friend bought from some idiot for $1.00!!!!! I know this guy was a real crack head!
Anyway, not sure if it is real or not. It has some patina green to it like iots been in the ground a while, but it is copper. I didnt know if Roman made copper coins or not, or is it just a reproduction. I have seen a coin just like this one on eBay for sale.
http://cgi.ebay.com/ws/eBayISAPI.dl...9547&_trksid=p3907.m32&_trkparms=tab=Watching

No date just XXI on the back bottom of coin. Anyone can shed some more light on this it would be apreciated!

 

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[FutureProspect784]

Could be Roman - it certainly looks misshapen enough to be from that period, anyway.

 

[PBK]

It's definitely a Roman coin, all right. Try identifying by the inscriptions at this link:

http://www.wildwinds.com/coins/findstr.html

 

[Silver Searcher]

Hi.... your coin is a Roman Coin of Diocletian the link PBK gave you is a very good site for Roman Coins, this one is very similar to yours but there are a few reverse types that are very similar. TK.