The silver dollar: it's not just a theme park in Missouri, or an old-timey reference in a 1985 Oingo Boingo song. It's legal U.S. tender -- or, at least it was, for a time. The United States ...

It once sold for just $100 in the distant past ... the 1893-S is the rarest of all Morgan Silver Dollars. 1893 was a year where Morgan Silver Dollars were not as prolifically as other years ...

Other notable mentions are the 1343 Edward III Florin, the 2007 Canadian Gold Maple Leaf, and Morgan Silver Dollars, all fetching significant sums. Rare vintage versions of these 90% silver coins ...