Valjoux 57 minute jumper

Valjoux

Valjoux is a historic Swiss movement manufacturer best known for its legendary mechanical chronograph calibres. Founded in the early 20th century in the Vallée de Joux, Valjoux produced reliable and widely used movements for many respected watch brands, including Heuer, Breitling, Rolex, Omega, and many others. Its calibres, such as the Valjoux 72 and Valjoux 7750, are especially admired for their durability, serviceability, and important role in the development of modern chronograph watches.

Jumper

A jumper is a small spring-loaded component used in watch movements to control positioning, indexing, or clicking functions. It is commonly found in calendar, chronograph, setting, and winding mechanisms. Jumpers help parts move cleanly from one position to another and may need replacement if they are bent, weak, broken, or causing unreliable function.