Armin Strom’s One Week makes seven days of stored energy visible

Armin Strom’s One Week First Edition arranges its mechanics as a visible composition. Two mainspring barrels occupy the right side of the openworked movement, while small seconds sit to the left. Light-blue PVD-treated plates and bridges distinguish the 25-piece First Edition, framed by an integrated steel bracelet.

The hand-wound ARM21 calibre supplies a seven-day power reserve from barrels working in series. A conical mechanism translates the remaining energy into a three-dimensional reserve indication. The steel case measures 41mm across and 10.6mm thick, with 100-metre water resistance. Reference ST23-OW.FE revisits the manufacture’s original One Week concept through a substantially redesigned movement.