Berna is perhaps the greatest forgotten watch brand of Saint-Imier, and the Droz factory on Marronniers 20 is just as unknown. But it was the first large and modern factory in Saint-Imier and should be remembered along with the waterproof pocket watches and industrial control stopwatches produced there. Equally important is the involvement of industry pioneers Alcide Droz, Ernest Degoumois, and the Jeanneret family, and the later integration of Berna with Leonidas.