Jaeger-LeCoultre

1833 with Antoine LeCoultre in Switzerland's Vallée de Joux, Jaeger-LeCoultre evolving from a small workshop into a renowned "Watchmaker of Watchmakers" by creating precise tools, like the millionometer (1844), and mastering complex calibers, famously partnering with Edmond Jaeger in 1903 to produce ultra-thin movements and culminating in the iconic Reverso (1931) and Memovox (1956) watches, all while integrating watchmaking crafts under one roof.