This undated photo provided on Wednesday, Dec. 19, 2012, by the U.S. Mint in Philadelphia shows a bonneted Martha Washington on a nonsense test piece. The Mint has been testing different materials to fiend less expensive ways to make coins. (AP Photo U.S. Mint)

This undated photo provided on Wednesday, Dec. 19, 2012, by the U.S. Mint in Philadelphia shows a bonneted Martha Washington on a nonsense test piece. The Mint has been testing different materials to fiend less expensive ways to make coins. (AP Photo U.S. Mint)