Two faces of a flying tourbillon: BA111OD's Onyx and Infinity

BA111OD’s Chapter 4 Onyx and Infinity Flying Tourbillons make an instructive contrast in contemporary Swiss watch design. The Onyx model, introduced in May 2025, uses a polished black stone dial to draw nearly all attention to the exposed flying tourbillon. The Infinity, revealed in April 2025, takes the opposite approach with a cosmic-blue sunray dial, moon-phase display and small seconds.

Despite the contrasting faces, both share a 41 mm steel case and the manually wound BA.02 movement, which offers approximately five days of power reserve. A four-o’clock crown, box-shaped sapphire and dressy leather straps establish a common architectural language.

The real distinction is editorial: the Onyx is an argument for minimalism, with negative space making one mechanical feature feel monumental; the Infinity is an argument for balance, framing multiple indications in a dynamic off-centre composition. These are not October 2026 launches—the latest reporting is a fresh look at watches first introduced in 2025.