Gold in them thar wrecks

Treasure hunting operations off the coast of South Carolina, on the wreck of the North Carolina (not kidding), have pulled up some rare gold coins.

"Extremely Valuable" Gold Coins Resurfacing From 19th-Century Shipwreck

According to the article (and others I've read about it), most of the coins were in private hands;  it wasn't carrying a treasure chest or anything like that.

It appears possible that some of the coins are from the U.S. Mint in Dahlonega, Georgia, which only operated for a short period of years, making them more rare than the usual horde of shipwreck gold coins.