Question: Rolex SA, is a Swiss luxury watchmaker, and was co founded, in which year, by Hans Wilsdorf, a German watchmaker, and the founder of noted watch brands Rolex and Tudor?

Context articles: Hans Wilsdorf
Sang Bleu
Rolex
Jean-Claude Biver
Waltham International
Raymond Weil
Omega SA
Zenith (watchmaker)
Baume et Mercier
Breitling SA

Hans Wilsdorf (March 22, 1881 - July 6, 1960) was a German watchmaker, and the founder of noted watch brands Rolex and Tudor.
Sang Bleu (] ) is an independent, multi-disciplinary media platform and creative agency encompassing "Sang Bleu" magazine, a publication centred around contemporary art, culture, fashion, fine art, performance art, literature, sociology, kink and tattooing; SangBleu, a typeface under the type design company Swiss Typeface and a creative agency called Sang Bleu.
 Sang Bleu was initiated in 2006 in London, UK, by Maxime Plescia-Büchi, its Swiss creative director, who currently runs it with his wife Hope Plescia-Büchi.
 Büchi performs as a tattoo artist at Sang Bleu London together with a dozen other tattoo artists and temporary resident artists.
 Sang Bleu is notable for its publications, its collaboration with Swiss luxury watchmaker Hublot and its work on celebrities like Kanye West and FKA Twigs.
 Sang Bleu is also known for creating logos and corporate typefaces for Balenciaga, Rick Owens, CSS Bard Hessel Museum, the City of Stockholm, Esquire magazine and Vogue.
 It has held events at department stores including Selfridges, the London Edition Hotel and Imperial Art Studios in Downtown Los Angeles.
 In May 2016, the first international Sang Bleu studio opened in Zürich, Switzerland.
Rolex SA ( ) is a Swiss luxury watchmaker.
 The company and its subsidiary Montres Tudor SA design, manufacture, distribute and service wristwatches sold under the Rolex and Tudor brands.
 Founded by Hans Wilsdorf and Alfred Davis in London, England in 1905 as Wilsdorf and Davis, Rolex moved its base of operations to Geneva, Switzerland in 1919.
Jean-Claude Biver (born September 20, 1949 in Luxembourg) is the CEO of TAG Heuer and CEO, board member, and minority shareholder of Hublot, a Swiss luxury watchmaker.
 Biver has been extremely successful at Hublot, and was previously successful in rejuvenating the Blancpain and Omega brands, both currently owned by Swatch Group.
 Biver is also known for his own exclusive cheese.
Waltham International SA is a Swiss luxury watchmaker based in Marin-Epagnier/Neuchâtel, Switzerland.
 It is one of the oldest watch making companies in the world, heir and owner of the legendary Waltham brand.
 It was founded in 1954 in Lausanne, Switzerland by the American Waltham Watch Company to provide necessary watch and movement parts which were not readily available in the USA.
Raymond Weil Genève (] ) is a Swiss luxury watchmaker, founded in 1976 in Geneva.
 It is a family company founded by Raymond Weil (1926-2014), and now managed by Olivier Bernheim (Weil's son in law) and his two sons, Elie and Pierre Bernheim.
 It is one of the last independent brands in the Swiss watch industry.
Omega SA ( ; ) is a Swiss luxury watchmaker based in Biel/Bienne, Switzerland.
 Britain's Royal Flying Corps chose Omega watches in 1917 as its official timekeepers for its combat units, as did the American army in 1918.
 Omega watches were the choice of NASA and the first watch on the Moon in 1969.
 Omega has been the official timekeeping device of the Olympic Games since 1932.
 James Bond has worn it in films since 1995; other famous Omega wearers, past and present, include John F. Kennedy, Prince William, George Clooney and Buzz Aldrin.
 Omega is owned by the Swatch Group.
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.
Baume & Mercier (] ) is a Swiss luxury watchmaker founded in 1830.
 It is a subsidiary of the Swiss luxury conglomerate Richemont.
Breitling SA (] ) is a Swiss luxury watchmaker based in Grenchen, Switzerland.
 Founded in 1884 by Léon Breitling in Saint-Imier.
 Breitling is known for precision-made chronometers useful to aviators.