Chapter 4 Skeleton Tourbillon T.V.D. (43mm)

FIRST IN-HOUSE TOURBILLON A major milestone for BA111OD, the Chapter 4 Skeleton Tourbillon T.V.D. introduces the brand’s first in-house calibre, developed in La Chaux-de-Fonds with renowned watchmaker Olivier Mory. Its openworked architecture reveals the mechanics of the movement, from the tourbillon at 7 o’clock to the barrel that delivers an impressive 120-hour power reserve. Crafted in 904L stainless steel with a gunmetal anthracite DLC treatment, this 43 mm tourbillon combines technical depth with a sharper, more contemporary design language. It challenges traditional luxury codes with a clear idea: making a Swiss Made tourbillon with real mechanical substance more accessible, without compromising on precision, construction or character. In-house tourbillon calibre Developed in La Chaux-de-Fonds with Olivier Mory. 120h power reserve A long autonomy made possible by a visible barrel architecture. 904L steel case Finished with gunmetal anthracite DLC. Chronometer-certified Certified by the Geneva Observatory of Chronometry, Timelab for precision and reliability.