Antoni Norbert Patek (French: "Antoine Norbert de Patek" ; 14 June 1812 – 1 March 1877), was a Polish pioneer in watchmaking and a creator of Patek Philippe & Co., one of the most famous watchmaker companies.
The Patek Philippe Henry Graves Supercomplication is one of the most complicated mechanical pocket watches ever created.
 The 18-karat gold watch was assembled by Patek Philippe and named after banker Henry Graves Jr who commissioned it out of his desire to outdo the Grande Complication pocketwatch of American automaker James Ward Packard.
 The two were both at the top of the watch collecting world, regularly commissioning innovative new timepieces.
Zenith SA is a Swiss luxury watchmaker.
 The company was started in 1865 by Georges Favre-Jacot at the age of 22, in Le Locle in the canton of Neuchâtel.
 Zenith was purchased by LVMH in November 1999, becoming one of several brands in its watch and jewellery division.
 Jean-Claude Biver became Interim CEO in 2017, replacing CEO Aldo Magada, who had replaced Jean-Frédéric Dufour in 2014.
 Zenith is one of the Swiss watch manufacturers that still produce their own movements in-house.
 The "El Primero" calibre, which was first released in 1969 and is still produced today, was one of the first automatic chronograph movements and has a frequency of 36,000 alternations per hour (5 Hz).
 This high rate allows a resolution of ⁄ of a second and a potential for greater positional accuracy over the more common standard frequency of 28,800 alternations per hour (4 Hz).
 The El Primero was honoured with a 2012 release of the El Primero Stratos Flyback Striking 10th, limited to 1,969 pieces (in honour of the original 1969 release date), that housed the same 36,000 vph movement and a sub-dial measuring in tenths of a second to make a complete rotation every ten seconds.
The Manistee Watch Company made low quality watch mechanisms that were put into cases by other companies.
 The watches were in 16 and 18 size.
 The company name was emblazoned on the back plate of most 18 size movements.
 Some 16 size movements were jeweled.
 The dials, jewels, and hairsprings for the mechanisms were purchased from European watch manufacturers, but all other parts aside from the outside case were produced at the Manistee Watch factory.
 Most of the jewels for the watches were from heliotrope garnet and manufactured specifically to the correct dimensions for the Manistee watches in Switzerland.
 The first watches made sold for five dollars each.
Audemars Piguet (AP) (] ) is a Swiss manufacturer of mechanical watches founded in 1875, and is one of the world's oldest watch manufacturers.
 The company is still owned by its founding families.
 The brand is considered to be one the best manufacturers of luxury watches and said to be a part of the 'Holy Trinity Of Watches' along with Patek Philippe and Vacheron Constantin.
Wincenty Gostkowski (March 29, 1807 – August 29, 1884) was a lawyer and associate of Antoni Patek and Adrien Philippe in the watchmaker Patek Philippe & Co. in Geneva, Switzerland.
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.
This is a list of watch manufacturers based in Germany.
 Note that manufacturers that are named after the founder are sorted by surname
The Hong Kong Watch & Clock Fair is a timepiece trade show held annually in Hong Kong.
 It is organised by the Hong Kong Trade Development Council (HKTDC), Hong Kong Watch Manufacturers Association Ltd., and The Federation of Hong Kong Watch Trades and Industries Ltd.
 The fair showcases both Hong Kong and international labels, and also serves a platform for participants to exchange information and market intelligence.The five-day-long trade fair is opened every year in the beginning of September at the Hong Kong Convention and Exhibition Centre.
The Gruen Watch Company was formerly one of the largest watch manufacturers in the United States.
 It was in business from about 1894 to 1958 and was based in Cincinnati, Ohio.
 It was founded in 1908 by German-born watchmaker Dietrich Grün, who changed the spelling of his name to "Gruen" because the letter ü does not exist in English.

Question: In which city did Antoni Patek found Patek Phillippe & Co., one of the most prestigious watch manufacturers?
Answer: Geneva