The company remains obscure in horological records; unlike better-documented contemporaries such as Helvetia or Longines, no verified founding date, manufacturing...
Onsa supplied “DU” marked watches are a distinct German military category. The “DU” designation signifies “Dienstuhr Verwaltung” (Administration Service Watch),...
The company remains obscure in horological records; unlike better-documented contemporaries such as Helvetia or Longines, no verified founding date, manufacturing...
TSILLA D.U. were manufactured by Fabrication d’Horlogerie Les Fils de Luc Vuilleumier, succeeded by Jean-Claude Vuilleumier, based in Tramelan-Dessus, Canton...