The Roamer 401 is a mechanical watch movement from the Aurore-Villeret calibre series. It is one variant among many, including the 160-164, 166, and 168-189. Despite variations in bridge layouts, the only notable difference identified so far is the presence of a lever cock in most models and a lever bridge in the Ebel 99. The Roamer 401 movement is manually wound and features a sub second function. It was commonly used around 1947.