At Baselworld, Biel-based manufacture Armin Strom launched a new collection of micro-rotor-equipped automatic timepieces. Uniquely, the in-house movement has a dial side micro-rotor with an opening that proudly displays it in the lower right quadrant of the dial.

The dial ring is off-center and features printed hour and minute markers. A small seconds sub-dial is located at 9 o’clock. The hour, minute, and second hands are mirror polished. The hour and minute hands are luminescent. An “Armin Strom” logo plate is screwed onto the dial, vertically, at 3 o’clock.

The manufacture made movement, caliber AMR13, runs at 2Hz, has 171 components (32 of which are jewels), and a 5-day power reserve. The going barrel is made of special brass. The plates and bridges are highly decorated and feature unique hand engravings ( a signature of the brand). The balance features gold adjustment screws. Adjusting off the mass moment of inertia by four clamped steel screws and a Breguet spiral curve.

Functions include hours, minutes, and small seconds. Water resistance is rated 50 meters. The Armin Strom Gravity collection is available in four variations: titanium, steel, PVD steel, and 18K rose gold. The dial ring for each piece matches the case color. Case measures 43.40 mm in diameter by 13 mm in thickness.

Each piece is delivered with an alligator horn-back leather strap with a buckle that matches the case material. There is an option for a folding clasp as well. Limited to 100 pieces per version. (Ref. TI13-GA.50 – titanium, ST13-GE.90 – PVD steel, ST13-GW.50 – stainless steel, RG13-GF.90 – 18K rose gold)