Chapter 4 Onyx Flying Tourbillon

The Chapter 4 Onyx Flying Tourbillon is a bold exercise in restraint  a watch that strips away the superfluous to reveal only what matters: the movement, the material, and the light.

Housed in our new 41mm concave case crafted from polished 904L stainless steel, the piece features a deep black onyx dial, mirror-polished and left untouched. No markers. Just the natural beauty of the stone, absorbing light like a black hole. The flying tourbillon at 7 o’clock floats freely, without an upper bridge, a mesmerizing display of balance and precision.

Beneath the sapphire box crystal, every detail is about clarity and contrast. The black-on-black logo is barely visible, by design a quiet nod rather than a shout.

Powered by a hand-wound Swiss movement with 120 hours power reserve developed with Olivier Mory, this piece is for those who understand the value of silence in design and the poetry of mechanics in motion.

MOVEMENT
Manual-winding mechanical movement BA.02 (based on BCP Tourbillon), 21,600 vph (3 Hz), variable-inertia balance wheel, 19 jewels. Tourbillon at 7 o’clock.


FUNCTIONS:
Hours – Minutes
Flying tourbillon at 7 o'clock

POWER RESERVE
120 hours (5 days)

FREQUENCE
3hz (21'600 Alt/H)

CASE
Stainless Steel 904L with welded lugs, 41mm diameter, 9.75mm thickness

DIAL
Onyx stone dial with white Super-Luminova hands

GLASS
Box-shaped sapphire crystal with double anti-reflective coating

CROWN
At 4 o'clock, engraved with the BA111OD emblem

WATER RESISTANCE
5 ATM

MAGNETIC RESISTANCE
2000 Gauss

SHOCK RESISTANCE
5000G

STRAP
Black calf leather with crocodile-style embossing, pin buckle.

MOVEMENT
Mechanical hand-wound tourbillon caliber BA.01, variable inertia balance with GMT function 19 jewels

POWER RESERVE
100 hours

FREQUENCE
3hz (21'600 Alt/H)

CASE
Grade 5 titanium with 5N PVD treatment, 44mm diameter, thickness 12.9mm including glass, lug-to-lug measurement 46mm.

DIAL
Semi-open, white SuperLuminova hands

GLASS
Sapphire crystal with double anti reflective coating

CROWN
At 4 o'clock, engraved with the BA111OD emblem

WATER RESISTANCE
5 ATM

MAGNETIC RESISTANCE
2000 Gauss

SHOCK RESISTANCE
5000G

STRAP
Soft grey nubuck leather strap with deployant clasp and easy-clip system