Patek Philippe & Co. is a Swiss watch manufacturer founded in 1851, located in Geneva and the Vallée de Joux. It designs and manufactures timepieces and movements, including some of the most complicated mechanical watches. It is considered by many experts and aficionados to be one of the most prestigious watch manufacturers. Past owners of Patek Philippe watches include Pope Pius IX, Queen Victoria, Victor Emanuel III of Italy, Christian IX of Denmark, and Albert Einstein.