Calibre 20H

Notes

The 20H Chronograph movement was the first chronograph movement made by Longines and may be the first industrially produced chronograph movement made by any company though they started to appear from companies like Waltham and Heuer around this time too. It was made at the behest of Longines's New York agent Jacques Eugene Robert who thought chronographs would appeal to the American market. Chronographs had mostly been produced in small numbers by artisans with hand fit pieces before this. Longines licenced a chronograph mechanism design by H. A. Lugrin, set about standardizing its production, and made tooling for its components. Lugrin was an inventor originally from Vaud in the Vallée de Joux who worked for Robert and whose brother would eventually found the company that became Lemania. The movement is a monopusher chronograph and it has no minutes counter. The 20H is built on the pre-existing 20L time only movement.