Gallet

Founded 1826 in La Chaux-de-Fonds by Julien Gallet, though some sources claim it's the world's oldest manufacturer with a history dating back to Humbertus Gallet, a clock maker who became a citizen of Geneva in 1466.

Vintage Gallet is best known for its line of chronographs, the most notable models include the MultiChron chronograph, the Regulator, the Flight Officer, the World Time chronograph, the Gallet 24 hour and Gallet Yachting chronograph.

It's unclear when the original Gallet ceased operations, but today it appears to be a privately held venture with an ongoing attempt at reviving the brand with a re-introduction of the Flight Officer model.