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 39 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.