CHAPTER 4.7 ONYX TOURBILLON – BA111OD
The Chapter 4.7 Tourbillon is a striking celebration of strength and finesse. Housed in a robust 40mm 316L stainless steel case, this timepiece balances architectural sharpness with poetic detail. The crown, engraved and positioned at 4 o’clock, nods to BA111OD’s signature aesthetic, merging traditional Swiss watchmaking codes with contemporary design.
What sets this model apart is its dial: a piece of genuine black onyx, carved from natural stone and set with exceptional care. A semi-open construction draws the eye to the hypnotic tourbillon exposed at 7 o’clock a mechanical ballet that rotates gracefully once per minute. Subtle contrasts between mineral opacity and mechanical transparency lend the watch a rare visual depth.
Inside beats the manually wound skeleton tourbillon calibre BA.01, developed in La Chaux-de-Fonds by acclaimed master watchmaker Olivier Mory. It delivers a remarkable 100-hour power reserve and a frequency of 21,600 vibrations per hour, ensuring enduring performance with handcrafted character.
A mirrored layer behind the dial reflects the movement’s upper side, inviting the wearer into a deeper view of its intricate artistry. Completing the piece is an ethically crafted crocodile-style leather strap in black, paired with a secure deployant clasp—elevating comfort without compromising style.
Specifications
• Movement: Hand-wound skeleton tourbillon calibre BA.01, variable inertia balance, 19 jewels
• Power Reserve: 100 hours
• Frequency: 3 Hz (21,600 vph)
• Case: 40mm stainless steel 316L, polished and brushed finish
• Crystal: Domed sapphire with double anti-reflective coating
• Dial: Semi-open genuine black onyx with Super-Luminova hands
• Crown: Engraved, positioned at 4 o’clock
• Water Resistance: 5 ATM
• Magnetic Resistance: 2000 Gauss
• Shock Resistance: 5000G
• Strap: Black crocodile-style ethical leather with deployant clasp
3 year international warranty.