Breitling SA is a Swiss watchmaker based in Grenchen, Switzerland. Founded in 1884 by Léon Breitling in Saint-Imier. Breitling is known for precision-made chronometers useful to aviators. The company fits certified chronometers in all models. Watches are usually marketed towards either diving (SuperOcean) or aviation (Navitimer). The styling of Breitling watches is characterized by polished cases, bracelets and large watch faces which are designed to improve readability. Many models have an automatic winding mechanism that is purely mechanical and frequently have complications.