Yours might be brass, I've worked in a foundry and used brass a lot. The "Copy" and "R" look stamped (after the cast).
The first thing I did was take another look at some of my Gallery Mint Museum reproductions that had been hiding in a mailing envelope for several years:
If you liked the pictures of those reproductions I posted, you might like these pictures, too-- Gallery Mint Museum 1792 set, all reproductions made to the exact specifications of the originals (including metal content) and struck with hand-engraved dies on coin presses like those that were used in the Mint's early days:
I'm not sure if you even can find a set like that any more. It was being produced by the Gallery Mint Museum several years ago, but the GMM's chief coiner died in early 2005 and the remaining partner, who was the chief engraver, decided to sell out his share of the operation shortly after that. The company that bought him out wasn't able to do much with the coinage operation, so they sold out to a guy in Nebraska, who had been offering some of the Gallery Mint Museum's reproductions, but I don't know if he still does. Here is his pricelist (last updated in 2008, apparently, so write first if you are interested) http://drlawrencelee.com/largecent.html Also, here is a very large web site prepared by a very big fan of the Gallery Mint Museum, where you can read all about the reproductions and fantasy pieces made by the GMM during its heyday: http://www.gmmnut.com/gmm/rl.html? Here's the page that talks specifically about the 1792 set (scroll about half-way down the page): http://www.gmmnut.com/gmm/gmm68.html#straight Here's a web site that talks about the GMM's Continental Dollar and Bar Cent: http://users.hal-pc.org/~edi/gmm/current.html It is interesting to note that the chief engraver of the GMM (whom I had met on several occasions) was very active in trying to get new coinage designs started in the late 1990s, and he even prepared and submitted two excellent dollar designs that eventually lost out to the Sacagawea dollar.
Here are some more Gallery Mint Museum reproductions. All reproductions were made with hand-engraved dies and planchets having the exact specifications as the originals on authentic coin presses: