per the faro web page I cited above ( http://www.lahacal.org/gentleman/faro.html ), although clay coppers are the ones we are familiar with, originally they were copper pennies ( Coppering
The Punters have the option of "Coppering" a bet. This means placing a copper token (traditionally a Penny) on top of the bet. A Coppered bet wins on the first card, and loses on the second (the opposite of a usual bet).)

I also only knew of the red and black ones ( I'd sell one or a few for $4 each if any want one or some), and I was surprised to see 7 colors in a recent ebay auction:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3276378842&category=899&sspagename=STRK%3AMEBDW%3AIT&rd=1

Robert