Hublot Spirit of Big Bang Tourbillon 5-Day Power Reserve Black Magic 42mm 645.CI.1137.NR

The Hublot Spirit of Big Bang Tourbillon 5-Day Power Reserve Black Magic, reference 645.CI.1137.NR, is a landmark expression of Hublot's philosophy that fine watchmaking and bold design need not be mutually exclusive. Introduced as part of the Spirit of Big Bang line, which reimagines the iconic tonneau silhouette of the original Big Bang, this 42mm reference distills everything the Geneva manufacture does best: high horology, avant-garde materials, and unmistakable visual drama.

Hublot's Spirit of Big Bang collection debuted as a natural evolution of the round Big Bang, retaining the brand's trademark multi-layer case architecture while adopting the elegant barrel shape long associated with haute horlogerie dress watches. The result is a case that feels simultaneously sporty and refined — a duality that defines modern Hublot. The 42mm diameter sits confidently on a wide range of wrist sizes, offering a slightly more intimate presence than the larger Spirit of Big Bang references without sacrificing visual impact.

The 645.CI.1137.NR is built entirely in black ceramic — what Hublot markets as Black Magic — a proprietary micro-blasted ceramic that achieves an extraordinarily deep, light-absorbing matte finish. Ceramic at this quality level is harder than steel, highly scratch-resistant, and hypoallergenic, making it as practical as it is beautiful. The ceramic bezel echoes the case, ensuring the entire watch presents as a monolithic, unified object on the wrist.

At the heart of this reference beats a hand-wound tourbillon movement endowed with a five-day power reserve — a technically ambitious specification that speaks to Hublot's serious investment in in-house manufacture calibers. The skeleton dial removes every gram of superfluous material between the wearer and the movement, allowing an unobstructed view of the tourbillon cage, the bridges, and the mainspring barrel as they work in concert. This level of visual transparency is the hallmark of grand complication watchmaking at its most theatrical.

The fabric-rubber-fabric strap — a trilayer construction unique to Hublot — reinforces the Spirit of Big Bang's sporty-luxe identity. The outer fabric layers lend texture and breathability while the rubber core provides the flexibility and water-resistance expected of a serious sports-inflected timepiece. Quick-change strap capability means the watch can be personalized to suit any occasion, one of the many practical advantages Hublot builds into every reference.

Buying the Hublot Spirit of Big Bang Tourbillon 645.CI.1137.NR from Bizak & Co. means acquiring a brand-new example from an authorized source committed to transparency, authenticity, and exceptional client service. Whether you are a seasoned collector adding a prestige tourbillon to your rotation or a first-time buyer seeking the finest Hublot has to offer, our team is ready to guide you through every step of the purchase. Reach out to Bizak & Co. for current pricing, availability, and complimentary expert consultation.