Breitling is a luxury brand of Swiss watches produced by Breitling SA, a private company headquartered in Grenchen, Canton of Solothurn (originally founded in Saint-Imier, Bernese Jura by Léon Breitling in 1884). The company exclusively offered Certified Chronometers in all models since 2000. Watches are usually oriented towards three categories: Diving (SuperOcean), Aviation (Navitimer), and Luxury (Breitling for Bentley). Aviation models such as the Navitimer offer aviation functions largely as complications, since their function in aviation has largely been replaced by modern electronic instruments. The styling of Breitling watches is characterized by polished cases and bracelets and large watch faces which are designed to improve readability. Many models feature an automatic winding mechanism that is purely mechanical (i.e. using no electronic components) and frequently feature complications. All Breitling watches are manufactured in Switzerland and are made from Swiss components. Raw movements are obtained from ETA and Valjoux and are modified in the Breitling Chronometrie Workshops, before undergoing COSC (Contrôle Officiel Suisse des Chronomètres) certification. Breitling has designed and manufactured two in-house movements: The Breitling calibre B01 and B04 (a B01 with an added GMT module). Quartz models such as the Breitling Aeromarine Colt start at $2,055.00 on a rubber strap, while mechanical models start at $3,000 and may reach prices above $100,000. Most higher priced models feature highly complex movements, gold cases and bracelets, and diamonds on the bezel. The most expensive mode at $175,000, the Breitling for Bentley Mulliner Tourbillon, features a platinum case, as well as a Flyback chronograph, perpetual calendar , and Tourbillon.