She later became famous for surviving the disaster, and was known after her death as ‘The Unsinkable Molly Brown,’ celebrated in the 1960 Broadway musical of the same name.
Bobby Livingston, vice president at RR Auction, said: ‘The Loving Cup is one of the most valuable pieces of Titanic memorabilia in private possession today.’
The official enquiry by the British Wreck Commissioner into the sinking of the Titanic was convened in London on May 2, 1912, and presided over by High Court Judge Lord Mersey.
Spanning over two months, Lord Mersey, lawyers, experts in shipbuilding and marine law questioned and listened to testimony from over 100 witnesses.
Concluding on July 3, 1912, the final report was issued on July 30, stating that the sinking was the result of the ship’s collision with the iceberg – not due to any design flaws with the ship – and the collision had been brought about by excessive speed in icy waters.
The report stopped short of condemning White Star’s Captain Smith for the accident.
Along with the American hearings, the British enquiry would result in several safety changes including 24 hour manned radios, distress rockets, ice patrols and sufficient lifeboats on board each ship.
The original building plan was discovered at the old Cunard Line office, which merged with White Star Line in 1934.
Originally sold in London in 1987, it then went on display at the Ulster Museum in Belfast.
It was then offered at auction, at which time it became a part of a distinguished private collection. It has since been on display at the Titanic Museum in Branson, Missouri.
Mr Livingston said: ‘Items of this magnitude used in the official inquiry are virtually unobtainable, this being one of only two plans that have ever come to market.’
Another item to be sold at the auction is what is thought to be the last postcard Titanic hero Jack Phillips ever wrote before he set sail on the doomed voyage, never to return.
Written on board the ‘Unsinkable Ship’ as it waited in port, it is a note of affection from a brother to his sister, letting her know he is safe and well.
The card, which has a photograph of the Titanic on its front, reads: ‘Thanks very much for your letter. Having glorious weather, went to Cowes yesterday. Will write later before we sail. Love all, Jack.’
Dated April 2 1912 Phillips, a maritime operator, added in the address panel, ‘Miss Elsie Phillips, 11 Farncombe St., Godalming.’
Other objects to be put up for sale include survivors’ belongings, a fragment from the Titanic’s grand staircase, and copies of newspapers which published front page reports about the catastrophe, including the New York Times, The Illustrated London News and The New York Evening Post.
RR said it expects the auction to earn between $700,000 (£422,000) and $1million (£603,000).