BA111OD marks a defining moment in its evolution with the strategic acquisition of BCP Tourbillons, a respected specialist in complex movement development and a long-time partner. This move strengthens the brand’s technical independence while safeguarding a rare regional expertise rooted in the Swiss canton of Neuchâtel. By integrating a key supplier of high-value mechanical calibres, BA111OD reinforces its ability to design and produce advanced complications in-house. The result is a clear step forward in watchmaking credibility, allowing the Maison to expand its creative horizons while securing its supply chain. This acquisition also reflects a commitment to heritage and continuity. It honors the legacy of Boris Petitpierre while ensuring that BCP Tourbillons remains under the leadership of master watchmaker Olivier Mory, whose expertise in tourbillon construction continues to shape the workshop’s direction. This alliance preserves a human and technical ecosystem deeply anchored in La Chaux-de-Fonds, where traditional craftsmanship meets forward-thinking innovation. For BA111OD, this is about building long-term legitimacy through deeper control of the movement, the very heart of every mechanical watch. This new chapter comes to life with the launch of the Chapter 4 Tourbillon T.V.D. in either 39mm or 43 mm, the brand’s first watch powered by an in-house developed tourbillon movement. More refined and assertive, it features a reworked architecture, a striking openworked design, and an impressive 120-hour power reserve. The hand-wound calibre beats at 3 Hz and is chronometer-certified, underscoring its precision. Housed in a redesigned 904L steel case with a tantalum-grey DLC finish, the watch balances modern design with mechanical transparency, offering a clear view of the tourbillon at 7 o’clock.