The letter is believed to be the sole example in existence from Gracie from onboard the Titanic, which sank off Newfoundland after hitting an iceberg, killing about 1,500 people on its maiden voyage.

A lettercard penned by one of the Titanic's most well-known survivors from onboard the ship, days before it sank, has sold for $399,000 at auction. In the note, written to the seller's great-uncle ...