Class Two 1804 Dollar: This dollar coin is one that you won't find in ANYONE'S collection: it's the only one in existence today. What is interesting about this coin is that it was originally a 1857 Swiss Thaler (the producer decided to strike the coin over another existing coin instead of making a planchet for it to be struck on).
Class Three 1804 Dollar: This numismatic legend is one of six in the class three type. Minted at the Philadelphia Mint illegally in the 1870s, this coin was designed by Robert Scot.
Four Dollar "Stella" Pattern Coin (1879): This is a coin that was not actually a coin! It was simply a design proposed to the US mint that was never struck. An interesting fact about this coin is that the face value isn't "Four Dollars", it's "400 Cents". Struck out of gold, this "Coiled Hair" version looks like a Morgan Dollar with a hairdo. I guess George T. Morgan wanted to try something new? There are only 20 "Coiled Hair" versions, so this is a must-see when you visit the Smithsonian.
1913 Liberty Head Nickel: One of five originally ( and illegally) minted. This coin was made for or by Samuel W. Brown, and he first revealed this coin to the rest of the numismatic community in August of 1920 when he displayed all five at an ANA convention. When B. Max Mehl, a popular merchant at the time, started to offer large sums of money for these rare coins, collectors and the public alike started to search for these in change. None were found, but the 1913 nickel made history, where it remains a collectors dream today.