Skip to product information
Hublot Big Bang Unico King Gold Blue Ceramic 44mm 421.OL.5180.RX - BRAND NEW

Hublot Big Bang Unico King Gold Blue Ceramic 44mm 421.OL.5180.RX - BRAND NEW Hublot Big Bang Unico King Gold Blue…

Reference 421.OL.5180.RX

Full watch configuration

Hublot Big Bang Unico King Gold Blue Ceramic 44mm 421.OL.5180.RX - BRAND NEW

$43,999.00
Requested condition
Brand New

By Hublot

Sourced to order. We confirm the watch, condition and final price before purchase. Reference images shown.

Eligible watches: 90-day returns for store credit only. Brand-new watches and other exclusions are final sale. Return terms.

Hublot Big Bang Unico King Gold Blue Ceramic 44mm 421.OL.5180.RX - BRAND NEW

Hublot Big Bang Unico King Gold Blue Ceramic 44mm 421.OL.5180.RX - BRAND NEW

Current Catalogue Asking Price:

Your Offer

$

Submit your offer for review. Availability and the final price require confirmation.

Preferred Contact Method
I have a trade-in / add a note

Reserve with $200

Hublot Big Bang Unico King Gold Blue Ceramic 44mm 421.OL.5180.RX - BRAND NEW

Catalogue watch price: $43,999.00 USD

Your $200 deposit is applied to the watch’s purchase price. It is refundable only if Bizak & Co. cannot fulfill your order.

Estimated remaining balance: $. Pay by bank wire or cryptocurrency after we confirm your watch and final invoice. Shipping and applicable taxes are additional.

Shipping details · Return terms

Watch shipping is paid with the final balance: $100 for U.S. overnight delivery or $500 internationally. Applicable taxes and import charges are additional.

After payment, our team starts the tailored search and contacts you to confirm the specific watch and final invoice. A deposit does not guarantee a unit, the listed price or a delivery date.

Need installments? Check eligibility before paying a deposit.

Speak with a Bizak & Co. specialist about this piece

|Call or Text

The Hublot Big Bang Unico 421.OL.5180.RX is a brand-new 44mm automatic watch crafted in Hublot's proprietary 18k King Gold, featuring a striking blue dial with index and Arabic numeral hour markers, a ceramic bezel, and a rubber bracelet. This reference unites the bold proportions and skeletonized architecture that define the Big Bang Unico collection with a deep oceanic blue that contrasts beautifully against warm rose gold tones.

The 421.OL.5180.RX stands out as one of the most visually compelling references in the Big Bang lineup, pairing the warmth of King Gold with the cool intensity of blue ceramic and dial — a combination sought after by collectors and first-time Hublot buyers alike. Contact Bizak & Co. today to purchase this brand-new reference at the best price or browse our full selection of Hublot watches for sale online.

Compare it across every Big Bang Unico reference we carry, or browse the full Hublot collection at Bizak & Co.

Buy this Big Bang Unico, trade in your current watch, or sell us yours. Contact Bizak & Co. to make an offer or request a fair-market valuation.

Not the exact one you’re looking for?

Source your dream watch

Learn More

The Hublot Big Bang Unico 421.OL.5180.RX is a masterclass in the Art of Fusion philosophy that has defined Hublot since its founding in 1980. Introduced as a bold reimagining of the original Big Bang, the Unico line elevated the collection by housing Hublot's in-house manufacture movement within an architecturally daring case — and the King Gold Blue Ceramic edition represents one of the most expressive interpretations of that vision. With a 44mm King Gold case, blue ceramic bezel, and vivid blue dial combining index markers and Arabic numerals, this reference commands attention without compromise.

Hublot's King Gold is a proprietary 18k rose gold alloy developed exclusively by the manufacture to offer superior scratch resistance compared to standard rose gold. The warmer, richer hue of King Gold deepens the contrast against the cool ceramic bezel and the electric blue dial, creating a chromatic tension that is entirely intentional and wholly unique to this reference. The use of ceramic — a material prized for its hardness, lightness, and resistance to fading — ensures that the bezel retains its color and luster for years of wear.

The dial of the 421.OL.5180.RX is finished in a deep blue that transitions beautifully under different lighting conditions, at times appearing as a rich midnight blue and at others revealing vivid cobalt tones. Hour markers rendered as polished indices alongside bold Arabic numerals give the dial a dynamic, sporty legibility that balances the luxury of the King Gold case. The open-worked architecture visible through the dial is a hallmark of the Unico series and provides a direct visual connection to the movement within.

At the heart of this watch beats the Hublot Unico automatic manufacture movement — a self-winding caliber developed entirely in-house and celebrated for its flyback chronograph functionality, column wheel construction, and lateral clutch mechanism. The movement is visible through the sapphire exhibition caseback, allowing the wearer and admirer alike to appreciate the engineering beneath the dial. The rubber bracelet, a signature Hublot element since the brand's inception, provides both comfort and a sporty modernity that complements the 44mm King Gold case on the wrist.

On the wrist, the Big Bang Unico King Gold Blue Ceramic 44mm asserts a confident presence befitting its position at the top of the Big Bang hierarchy. The 44mm diameter and the multi-part case architecture create a bold silhouette that is equally at home at a formal event or alongside weekend attire — a versatility that has made the Big Bang Unico one of the most recognizable luxury sport watches in the world. Collectors drawn to the fusion of materials, the in-house movement, and the limited-edition color palette regard this reference as a cornerstone acquisition.

Bizak & Co. is proud to offer this brand-new Hublot Big Bang Unico 421.OL.5180.RX at the best price available. Purchasing from Bizak & Co. means buying with the confidence of an authorized and experienced luxury watch dealer committed to authenticity, transparency, and exceptional service. Whether you are adding to a serious collection or investing in your first Hublot, our team is ready to assist — contact us today or buy online at bizakandco.com.

Technical Details
Reference
421.OL.5180.RX
Model
Big Bang Unico
Movement
Automatic
Case material
Rose Gold
Bracelet material
Rubber
Dial
Blue with index and Arabic numerals
Case size
44mm
Requested condition
Brand New
FAQ

1. What makes the Hublot Big Bang Unico 421.OL.5180.RX special?
The 421.OL.5180.RX pairs Hublot's proprietary King Gold case with a ceramic bezel and a vivid blue dial featuring both index and Arabic numeral markers — a striking fusion of materials that is entirely unique to this reference. The use of King Gold, Hublot's exclusive scratch-resistant 18k rose gold alloy, elevates this model above standard Big Bang references. Together these elements embody Hublot's Art of Fusion philosophy at its most expressive.

2. What movement powers the Hublot Big Bang Unico 421.OL.5180.RX?
This reference is powered by the Hublot Unico in-house manufacture automatic movement, a self-winding caliber renowned for its flyback chronograph complication, column wheel, and lateral clutch. The movement is visible through a sapphire exhibition caseback, showcasing Hublot's in-house watchmaking expertise. The Unico caliber represents a significant milestone for Hublot as a fully integrated manufacture.

3. What is the case size of the Hublot Big Bang Unico King Gold Blue Ceramic?
The Hublot Big Bang Unico 421.OL.5180.RX features a 44mm case crafted in King Gold, Hublot's proprietary 18k rose gold alloy. The 44mm diameter gives the watch a bold, assertive presence on the wrist consistent with the Big Bang Unico's sport-luxury identity. The multi-part case construction further enhances its substantial visual impact.

4. Is the Hublot Big Bang Unico 421.OL.5180.RX suitable for everyday wear?
Yes — the Big Bang Unico is designed as a luxury sport watch built to withstand the demands of active daily wear. The ceramic bezel resists scratches and color fading, King Gold offers improved scratch resistance over standard gold alloys, and the rubber bracelet delivers comfort and durability. This makes the 421.OL.5180.RX as practical as it is luxurious.

5. What is the dial and bezel like on the 421.OL.5180.RX?
The dial is finished in blue and features both index hour markers and Arabic numerals, giving it a dynamic and highly legible appearance with an open-worked element characteristic of the Unico series. The bezel is crafted from ceramic, a material prized for extreme hardness and long-term color retention. The combination of blue ceramic and blue dial against the warm King Gold case creates one of the most visually compelling contrasts in the Big Bang lineup.

6. How can I buy the Hublot Big Bang Unico 421.OL.5180.RX from Bizak & Co.?
You can purchase this brand-new Hublot Big Bang Unico 421.OL.5180.RX directly online at bizakandco.com or by contacting our team for personalized assistance and best-price confirmation. Bizak & Co. is a trusted luxury watch dealer committed to authenticity and customer satisfaction. Reach out today to secure this highly sought-after reference before it sells.

Certified Authenticity

Every watch is authenticated before delivery.

Real Family Business

You're buying from genuine people, 30 years in business.

Bizak & Co. Warranty

Every watch is checked by us before shipping.

5 Years Warranty

Our five-year Bizak & Co. warranty covers manufacturing defects affecting mechanical operation under normal use, starting on delivery. It is separate from any remaining manufacturer warranty.

Exclusions include accidental damage, misuse, water damage, cosmetic damage, normal wear, loss and theft. Coverage and service availability for vintage or modified watches are confirmed in writing before purchase.

Read the full warranty terms and service instructions. 

90-Day Returns for Store Credit

Eligible watches may be returned within 90 days for store credit. Brand-new watches and other exclusions are final sale.

Read eligibility, condition requirements, and exclusions.

Insured delivery

Insured shipping

U.S. overnight shipping is $100; international shipping is $500. Dispatch takes 2–3 business days after your wire clears. International transit times vary. Shipping details.

You might also like...

Customer Reviews

Read our reviews on Trustpilot

  • Great family business

    Great family business. They went out of their way to make my purchase go smoothly, they definitely earned my watch business!

    Paul

    Read on Trustpilot ↗
  • Good seller

    Good seller. Honest family

    Mateusz

    Read on Trustpilot ↗
  • Honest family company

    Honest family company. I’ve done business many times!

    Mollie

    Read on Trustpilot ↗
  • Trusted Seller

    Trusted Seller, Definitely recommend for all watches purchase!

    Consumer

    Read on Trustpilot ↗
  • Trusted and honest seller

    Trusted and honest seller. Deal with confidence.

    Jean Dib

    Read on Trustpilot ↗