The LeCoultre watch company was founded by Antoine LeCoultre in 1833 in the Swiss village of Le Sentier. Initially focused on producing high-quality movement parts, the company quickly gained a reputation for its precise and reliable products. In 1847, LeCoultre invented the millionometer, a tool that allowed for the precise measurement of micrometres, which helped to further establish the company’s reputation for quality. In 1903, LeCoultre merged with the Parisian watch company Jules-Jurgensen, and the company began producing its own complete timepieces under the name “LeCoultre & Cie”. In the 1920s and 1930s, LeCoultre became known for its Art Deco-style watches and its “Atmos” clock, a clock that runs on changes in temperature and atmospheric pressure. In 1937, the company merged with the Jaeger watch company to form the infamous Jaeger-LeCoultre.