Two years after the original Bugatti Tourbillon set the horological world alight, Jacob & Co. has pushed the concept to its absolute limit. Unveiled in April 2026, the Bugatti Tourbillon Sapphire Crystal substitutes every exterior component — the caseback, caseband, and upper bezel — with solid, lab-grown corundum. Jacob & Co. produced only two examples: one in signature green, the other in Jacob Arabo’s personal favourite baby blue. At $1,200,000 each, these are unique pieces in the truest sense.
Dial Architecture
The display directly mirrors the instrument panel of Bugatti‘s hypercar, and the layout rewards scrutiny. The 30-second flying tourbillon occupies the left position; a dual power reserve subdial on the right independently tracks both the movement’s 80-hour reserve and the V16 automaton’s 20-sequence capacity, a genuinely rare feature in contemporary watchmaking. At the centre, hour and minute hands each execute a 270-degree retrograde arc before snapping back to zero. The hour hand jumps precisely to each new hour and locks there, while the minute hand advances in discrete one-minute increments rather than sweeping continuously. All three subdials carry colour-coordinated finishing — either green or blue — with a contrasting central outline and a red Bugatti logo. Jacob & Co.’s in-house designers produced the lacquered white hands, which sustain legibility against the complex backdrop, and PVD-treated exhaust manifolds in matching colour complete the automotive vocabulary across the face.
Caliber JCAM55
The hand-wound JCAM55 measures 38.60 x 46 mm, stands 10.80 mm tall, assembles 557 components, and runs at 21,600 vph (3 Hz). Notably, a single crown shaped as a Bugatti dashboard control knob, finished with finely cut inner knurling for tactile precision, winds both the movement and the automaton simultaneously. Time setting happens via a flip-out bow built into the caseback, keeping the crown entirely dedicated to winding. The tourbillon cage completes one full rotation every 30 seconds — the fastest Jacob & Co. has ever produced — and a sapphire upper bridge frames it without obscuring the view. The V16 engine block automaton takes centre stage: Jacob & Co. carved it from a single block of transparent sapphire into which 16 cylinders were drilled. Sixteen titanium pistons, driven by a single-axis crankshaft, fill those cylinders. Pressing the crown pusher triggers a 20-second sequence where all 16 pistons cycle in synchronised succession. Furthermore, a 16-pipe PVD exhaust manifold system connects directly to the automaton block itself, producing one of the most elaborate sub-assemblies in watchmaking history.
The Sapphire Crystal Case
Measuring 55 x 44 mm with a 15 mm height, the case achieves 30 m of water resistance. Jacob & Co. begins each structural component from a full block of lab-grown corundum, a material that sits at 9 on the Mohs hardness scale, surpassed only by diamond and select industrial ceramics. Because pure corundum carries no elemental impurities, it delivers full optical transparency, and Jacob & Co. exploits this with a 360-degree open architecture that conceals nothing. Each block demands cutting, shaping, drilling, and polishing through specialised tooling running at precisely calibrated speeds — too slow and the material resists the cutter, too fast and it fractures irreparably. Consequently, the process consumes over 800 hours of machining per case, a figure that contextualises the two-piece production run entirely. Eighteen-karat gold details accent the structure throughout, and the crown combines metal with a sapphire element, finely knurled inside for grip. The rubber strap carries louver patterning referencing Bugatti’s body vents and matches the movement’s colour scheme, closed by a deployment clasp that pairs rose gold with titanium.
A New Benchmark
Jacob & Co. and Bugatti have together produced something that no other collaboration in luxury watchmaking has attempted at this scale of technical ambition. The Bugatti Tourbillon Sapphire Crystal does not simply reference automotive design; it internalises it into every material choice and mechanical decision. Two unique pieces, two colours, one price: $1,200,000. Transparency, it turns out, is extraordinarily expensive.
