Crowds gather for a memorial to the more than 540 people from Southampton who died on the Titanic.
Simon Topman made the connection during the scene where Rose blows a whistle to attract rescuers.
The auction takes place in the same week as Southampton marks the 114th anniversary of the Titanic tragedy.
Electrician William Parr, who was born in Wigan, kept working as the ocean liner split in two.
The watch belonged to the American businessman Isidor Straus, who died alongside his wife in the disaster.
The watch belonged to Bavarian-born American businessman Isidor Straus, who died in the disaster.
The auctioneer describes the collection as "truly remarkable".
Northamptonshire victims are remembered on the anniversary of the discovery of the Titanic wreck.
A new exhibition gives visitors a "boarding pass" bearing the name of a real passenger on entry.
