Hublot Big Bang Unico King Gold Jewellery 44mm 421.OX.1180.RX.0904 - BRAND NEW

The Hublot Big Bang Unico is widely regarded as one of the most consequential luxury sport watches introduced in the twenty-first century, and reference 421.OX.1180.RX.0904 represents the collection at one of its most extravagant expressions. Launched originally in 2005, the Big Bang distilled Hublot founder Carlo Crocco's fusion philosophy — the deliberate collision of precious metals, rubber, and high-horology — into a single case. The Unico designation takes that vision further by housing Hublot's own in-house flyback chronograph movement, a milestone that transformed Hublot from an assembler into a true manufacture.

The 44mm case in King Gold is central to the character of this piece. King Gold is Hublot's proprietary 18-carat rose-gold alloy, developed in partnership with a specialist metallurgical laboratory to achieve a richer, deeper orange-rose hue than standard red gold while dramatically improving scratch resistance — a critical consideration on a watch intended for active, daily wear. The result is a case that retains its lustrous warmth far longer than conventional precious-metal cases of comparable quality.

The diamond-set bezel transforms 421.OX.1180.RX.0904 from a sports chronograph into a high-jewellery statement. Diamonds are set around the full circumference of the bezel, catching light at every angle and creating a brilliant halo around the striking case architecture. The combination of King Gold's warm tone and the icy brightness of the diamonds produces a contrast that is simultaneously bold and refined, embodying Hublot's Art of Fusion ethos in material terms.

Against this precious backdrop, the black dial commands attention with clarity. Index markers and Arabic numerals provide immediate legibility, a nod to the watch's sporting roots. The signature Big Bang open-work sub-dials and chronograph architecture are visible, reinforcing the mechanical narrative even on a piece this richly jewelled. The rubber strap — a Hublot hallmark since the brand's founding — grounds the watch in wearability, its tactile comfort making the 44mm case sit surprisingly well on the wrist for all-day use.

Powering the watch is an automatic movement from Hublot's in-house Unico caliber family, a column-wheel flyback chronograph architecture developed entirely within the manufacture. The movement is visible through the skeletonized dial and caseback, inviting the wearer to appreciate the mechanical complexity beneath the jewellery surface — a duality that is the very definition of the Big Bang Unico philosophy.

Bizak & Co. offers this reference 421.OX.1180.RX.0904 brand new, complete with original box and papers, ensuring full manufacturer warranty coverage and complete peace of mind. Buying from Bizak means working with a knowledgeable, trusted luxury watch specialist committed to transparency and competitive pricing. Whether you are adding a centrepiece to a serious collection or searching for an unforgettable gift, this is a rare opportunity to acquire one of Hublot's most spectacular references in pristine, unworn condition. Reach out to our team to confirm availability and secure yours today.