Zenith 3019/400 minute counter jumper 8270

Zenith

Founded in 1865 by Georges Favre-Jacot, Zenith is a prestigious Swiss watch manufacture renowned for its in-house movements and exceptional chronometric precision. The brand is most famous for creating the El Primero" in 1969, one of the first automatic high-frequency chronograph movements, capable of measuring time to 1/10th of a second. Famous models include the Chronomaster, the Defy, and various pilot's watches. Zenith is a true manufacture, developing all its movements in-house, with the El Primero calibre being its most iconic. Zenith's legacy is one of pioneering high-frequency movements and a commitment to precision."

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.