The Graves
The Henry Graves timepiece made by Swiss watchmaker Patek Philippe is photographed during a press preview by Sotheby's auction house on November 5, 2014 in Geneva. A gold watch billed as the most expensive -- and most complicated -- in the world fetched a record £13.6 million (17.1 million euros) when it went under the hammer in Switzerland on November 11, 2014 the Sotheby's auction house involved said.Getty Images

The owner of the world's most expensive watch, estimated at £15million ($25m), mysteriously passed away at his London home last week, two days before the cursed watch was due to be sold.

The watch was put up for auction by the 48-year-old Qatari billionaire, Sheikh Saud bin Mohammed Al-Thani, who is also known to be one of the world's biggest art collectors.

Complications from a heart condition are believed to have led to his sudden death.

The 1933 Patek Phillipe time piece has a legacy of bringing bad luck to its owners, reported Mirror.

The watch was created by Phillipe at the request of its first owner, Henry Graves, who approached the watchmaker with the request to make the world's most complicated watch in 1925.

It took the legendary watchmaker three years to research and an additional five years to finish making the watch known as 'The Graves'.

Seven months after acquiring his personalised watch, Graves' best friend died and his son too passed away in a car crash a little later.

Al-Thani had purchased the watch 15 years ago for an estimated £7 million ($11m) and it was sold to an undisclosed buyer in Geneva for £13.6 million ($22m) two days after the Sheikh's passing.

The watch boasts of a perpetual calendar, moon phases, power reserve, and sunset and sunrise indications.

It has held the title of the world's most complicated watch for 56 years.