Discover Chapter 4 Tourbillon, BA111OD’s most uncompromising expression of contemporary Swiss watchmaking. Conceived and brought to life exclusively with local partners in the Neuchâtel and La Chaux-de-Fonds region, this collection reflects a rare concentration of expertise, proximity and mechanical substance. At its heart beats a hand-wound Olivier Mory tourbillon movement offering a 100 or 120-hour power reserve depending on the reference. Whether revealed through bold skeleton architecture or expressed through more restrained closed-dial executions, each piece embodies a singular vision of time, precision and emotion. Chapter 4 Tourbillon is where BA111OD makes the exceptional accessible without diluting its intensity, its complexity or its watchmaking depth.