Jaeger-Lecoultre 1900 (AS) ratchet 415

Jaeger-LeCoultre

Founded in 1833 by Antoine LeCoultre, Jaeger-LeCoultre is a revered Swiss haute horlogerie manufacture, often called the Grand Maison" of the Vallée de Joux. The brand holds over 1,200 calibres and hundreds of patents, known for its exceptional technical prowess and artistic finishing. Famous models include the Reverso, with its iconic reversible case, the Master Ultra Thin, and the Polaris. Jaeger-LeCoultre is a true manufacture, developing all its movements in-house, such as the Calibre 899 and the complex Calibre 101, the world's smallest mechanical movement. It embodies the pinnacle of Swiss watchmaking artistry and innovation."

Ratchet

A ratchet is a toothed component used in the winding system of a mechanical watch, helping control the winding and release of mainspring power. It often works together with clicks, wheels, and springs to prevent unwanted reverse movement. Ratchets may be replaced when teeth are worn, broken, slipping, corroded, or causing problems with winding efficiency.