The Red Book of US Coins definition says "Experimental or trial coin, generally of a new design denomination or metal." Collectors know these coins are some of the rarest and most difficult to obtain pieces ever minted. Below is an article from Coin World magazine. The pattern coin featured is from 1872 and struck in aluminum. The Hammer price was an astounding $132,000! William Barber’s handsome Amazonian design is seen on this Proof 67 Cameo 1872 $20 double eagle pattern struck in aluminum that sold for $132,000 at the post-FUN auctions. William Barber’s Amazonian design is one of the most famous in the pattern series. Some examples feature a full seated Liberty, while others — like the Judd-1252 1872 $20 double eagle graded … [Read more...]