Hublot Shaped Spirit of Big Bang Tourbillon Orange Sapphire 42mm 645.JO.0120.RT - BRAND NEW

The Hublot Spirit of Big Bang Tourbillon Orange Sapphire — reference 645.JO.0120.RT — is one of the most visually arresting and mechanically sophisticated watches Hublot has ever produced. Born from the Art of Fusion philosophy that has defined the Hublot brand since its founding, the Spirit of Big Bang line reimagines the iconic Big Bang silhouette into a refined tonneau shape, a form language that echoes haute horlogerie tradition while remaining unmistakably modern. This 42mm reference pushes that vision to its absolute limit with a case machined entirely from scratch-resistant sapphire crystal — a material choice that demands extraordinary manufacturing precision and transforms the watch into a wearable sculpture.

The sapphire case is not merely a novelty; it is an engineering achievement. Sapphire crystal ranks second only to diamond on the Mohs hardness scale, meaning the case resists scratches from virtually any material encountered in daily life. More importantly for a tourbillon, the transparency of the material allows every angle of the watch to reveal the movement working inside, dissolving the boundary between dial side and caseback and giving the wearer a 360-degree window into fine watchmaking. The tonneau-shaped case at 42mm sits confidently on the wrist without overwhelming it, a size Hublot has calibrated specifically for the Spirit of Big Bang to balance wrist presence with wearable comfort.

Color is deployed here with the conviction of a luxury fashion house. The vibrant orange dial and matching orange bezel create a monochromatic intensity that is simultaneously playful and assertive. Orange has become one of Hublot's signature accent colors — a nod to the brand's Genevian roots and its longstanding association with energy and innovation — and nowhere is it used more dramatically than when set against the crystal-clear sapphire case. The rubber strap, a Hublot hallmark since the very first Big Bang, reinforces the sporty-luxury DNA and ensures comfort on the wrist throughout the day.

At the technical core of reference 645.JO.0120.RT is a hand-wound tourbillon movement. The tourbillon, invented in the late eighteenth century to counteract the effects of gravity on a watch's rate accuracy, has evolved into the supreme symbol of traditional watchmaking mastery. Viewing it through the open dial and the transparent sapphire case creates an unobstructed spectacle of rotating cage, escape wheel, and lever that few complications can match for sheer visual drama. For collectors who prize both horological substance and aesthetic boldness, this combination is exceptionally rare.

Why buy reference 645.JO.0120.RT from Bizak & Co.? This watch arrives brand new, meaning it carries the full manufacturer's warranty and shows zero wear on the sapphire case, the rubber bracelet, or the movement. Bizak & Co. specializes in sourcing new and pre-owned luxury timepieces with the diligence and expertise that discerning collectors expect. Whether you are adding to an established collection or making your first significant horological investment, the Spirit of Big Bang Tourbillon Orange Sapphire represents an extraordinary convergence of materials innovation, chromatic drama, and mechanical excellence. Visit bizakandco.com to buy online or reach out directly — our team is ready to answer every question and ensure a confident, informed purchase.