Patek Philippe’s Supercomplication

The world second most expensive watch is Patek Philippe’s Supercomplication. This watch became the one of most expensive watch in the world when it was sold at auction in 1999 for over $11 million USD.
The gold pocket watch, which featured 24 complications, was the result of a long-standing competition between two magnates of America's Gilded Age. New York financier Henry Graves Jr. and Ohio automobile engineer James Ward Packard vied with one another to own a timepiece with the greatest possible number of complications. (Complications are mechanical functions of the watch other than the hours, minutes and seconds.) Packard commissioned 13 complicated watches from Patek Philippe between 1900 and 1927. They included a perpetual calendar with phases and age of the moon, indication of sunrise and sunset, and a celestial chart depicting the constellations of stars in the sky over Packard's home in Ohio.
This timepiece that took three years to design and five years to produce.When completed in 1933, the watch had a different horological function for each hour of the day and included a chart of the nighttime sky over Graves' home in New York.
The process eventually ended with a watch commissioned by Graves.Jr. Graves died in 1953, and his heirs sold the watch to the Time Museum in Rockford, Ill., in 1968. When the museum closed,the watch was sold at Sotheby's in 1999. All together(80 other pieces from the collection of Museum in Rockford), they brought $28 million. The Graves watch had a presale estimate of $3 million to $5 million, and sold for $11,003,500 to an anonymous collector.
Now it's a historical thing in the world. That was the most expensive watch till July 18th, 2008. After above day that title goes to another watch. but still now that atek Philippe’s Supercomplication is second place in list.