It's a case that combines history and mystery--and very valuable gold coins. The stakes were certainly high: One of these rare $20 pieces sold for a record $7.59 million in 2002. Here's the story.

Double-headed 5c piece from 2007 is one of the rarer minting errors. A coin in really good condition can sell for about $3500, while those in poor condition still fetch a few hundred RELATED ARTICLES ...

An exceptionally rare 1933 “Double Eagle,” one of the last gold coins struck for circulation in the US, almost doubled the previous auction record when it went under the hammer in New York.

A double-headed 5cent coin from 2007 that made it into circulation has been valued between $3,000 and $5,000 depending on its condition 'When the mint sets up its press to make coins, ...

While it’s not known exactly how many double-headed coins were made, there’s a good chance there could be more out there. Other rare coins. It’s not the only Aussie coin that has skyrocketed in value, ...

2007 double headed coin: This five cent coin has the Queen’s head printed on both sides and is worth up to $6,500. 2001 federation coin: Worth $100, this $1 coin features the Queen’s head upside down ...

A set of double-headed platinum coins have been created to mark the Queen's 70th wedding anniversary. The Queen and the Duke of Edinburgh appear on the coins, specially struck as they become the ...