The Armin Strom Gravity was the first watch from the Biel-based manufacture to feature an automatic winding mechanism with micro rotor. With this first series of automatic watches driven by the manufacture’s new AMR13 calibre, Armin Strom wanted to express the essence of a fundamental law of physics —that of gravity. Thus, the laws of gravity are used in an automatic watch to transform movements into a mode of indicating the time. However, the Armin Strom Gravity Date Fire ref. RG14-DF.90 is not necessarily powered by the same AMR13 calibre but by the ADD14 automatic calibre with a power reserve of 5 days. The Armin Strom Gravity Date —just like the Gravity collection— is designed to proudly display the micro rotor while also providing the wearer with date information as well as a useful night/day indicator. The visibility of this mechanism is made possible thanks to an innovative concept of transmission for the rotor, which remains smaller in size than the diameter of the going barrel.