The Armin Strom One Week Air ref. TI10-WA.11 from the Biel-based manufacture, is a 7-day power reserve manual wound watch that brings the best of Armin Strom in a 100-piece limited edition. The Armin Strom One Week is available in four different iterations —Earth, Water, Fire and Air— and the Air one we are reviewing here, is one of our favorite ones. Powered by the manual wound calibre ARM09, the One Week Air is designed to proudly display its inner workings with a beautiful skeletonized dial ring with white appliqués and power reserve with concentric running seconds indicator at 9 o'clock and is equipped with a light but sturdy titanium case measuring 43.40 mm in diameter and 13 mm in thickness.