Christie's Dubai will auction a Patek Phillippe watch belonging to Egypt’s King Farouk next month, with a estimated price of USD 400,000-800,000. 

The reference 1518 model is part of a larger collection of 180 watches that are up for sale at the auction house, and which will be on public view from 19 March to 23 March, the date of the auction.

The king was the great-great-grandson of Muhammed Ali, and ruled Egypt from 1936 to the revolution in 1952.

A press release from Christie’s notes that King Farouk inherited his love of watches from his father, King Fouad I. The reference 1518 model was launched in 1941 with only an estimated 281 pieces ever created.

“The Patek Philippe reference 1518 is celebrated as the first perpetual calendar chronograph wristwatch produced in series by any watch company," it states.

The watch has an encraving of the royal crown of Egypt on the back of the case, with a star and a half-moon and a letter F.

“Farouk’s father believed that the letter F was lucky for his family and began the names of his six children with this letter," writes the release.