Doubloon

"Captain Jack Sparrow? Owes me four doubloons. Heard he was dead."

- Weathered sailor to William Turner

The Spanish Doubloon was a seven-gram (.225 Troy-ounce) gold coin minted in Spain, Mexico, and the Spanish settlement of Nueva Grenada that was used widely in the Americas during the Age of Piracy.

History
The word "doubloon" has its roots in the Latin word "duplus", meaning double, a reference to denomination of this coin worth two escudos. These gold coins were eventually minted in four denominations, worth one, two, four, and eight escudos respectively.

Throughout the 16th and 17th centuries, gold doubloons played a pivotal role in the Spanish economy and were a major part of its colonial activities. Doubloons minted in the Americas were carried on Spanish galleons throughout the Caribbean and across the world to trade for highly sought after commodities such as silks and spices. As they made their way across the vast seas and oceans, the captains of these ships were always wary of attack from marauding pirates. The pirates knew full well that if they could manage to intercept a Spanish galleon en route to its trading destination, their chances of finding gold aboard were extremely high.

At some point during the War against piracy, Governor Weatherby Swann offered a reward of 1,000 doubloons for the capture of Jolly Roger, one of the deadliest pirates in the Caribbean.