A letter written on board the Titanic in April 1912 is being sold at auction this weekend.
It is the only letter to go down with ship and survive, and as one of the last known letters to have been written on the Titanic is expected to fetch up to £80,000 (€89,000).
The letter was written on Titanic-headed notepaper by the American businessman Oskar Holverson the day before the ship sank.
It gives details of the palatial ship and talks of how the author and his wife were looking forward to their arrival in New York.
The couple were travelling in the first class section of the ship and had been on holiday in South America and England.
They bought their first class ticket for £52 and boarded the Titanic at Southampton on 10 April 1912.
In the letter, Mr Holverson said the couple were enjoying their trip, saying "so far we have had good weather, if all goes well we will arrive in New York Wednesday AM".
The letter was never sent as Mr Holverson was among the 1,500 people who died when the ship went down.
His body was recovered along with the letter, while his wife Mary Holverson survived the sinking.
Andrew Aldridge, of Auctioneers Henry Aldridge & Son, has described the letter as unique.
He said "I think quite simply what we are talking about is the ultimate letter from the Titanic ... It’s the only letter written on Titanic stationary actually to have gone into the water, so it’s bearing those scars from that immersion in the cold North Atlantic".
The letter is not the only artifact being sold at this weekend's auction.
Another piece included in the sale is a suitcase belonging to Millvina Dean, who was just two months old when the ship went down and is the youngest survivor of the tragedy.
A set of keys belonging to first class steward Sidney Daniels will also go under the hammer.
The 18-year-old was the last surviving crew member of the luxury liner's doomed maiden voyage.
The keys belonged to lockers on F Deck which were used by third class passenger and a reserve of between £50,000 - £60,000 has been placed on them.
Another item up for auction is a pair of previously unseen photos of Titanic as she left Southampton.
The 4 x 5 inch photographs are estimated to sell for between £8,000 and £12,000.
Mr Aldridge said these photos "represent a rare opportunity for a collector to acquire a pair of photos showing the very start of Titanic's ill-fated first and last voyage."
There are also pieces of memorabilia from James Cameron's multi-award winning film Titanic included in the auction, which will take place tomorrow in Wiltshire, in the west of England.
