Rendez-Vous Tourbillon

In 1833, Antoine LeCoultre (1803–81) founded a small workshop in Le Sentier, Switzerland, for the manufacture of high-quality timepieces. In 1844, he measured the micrometre (μm) for the first time and created the world's most precise measuring instrument, the millionometer, capable of measuring to thousandths of a millimetre. In 1847, LeCoultre developed a system that eliminated the need for keys to rewind and set watches, using a push-piece that activated a lever to change from one function to another. In 1851, he was awarded a gold medal for his work on timepiece precision and mechanization at the first Universal Exhibition in London.