Product Overview

The HB Factory Hublot Big Bang Unico 421.OL.5180.RX replica combines a rose gold tone case with a blue ceramic bezel and blue rubber strap. Its blue skeletonized dial reveals mechanical details, while contrasting hands and hour markers define the display.

Rose gold tone subdial surrounds complement the case. Meanwhile, the blue outer track, bezel and strap create a coordinated appearance.

The supplier lists a 45mm case and a “HUB 1280 Automatic” replica movement. This movement designation does not indicate an original Hublot calibre or guarantee equivalent construction and functions.

Technical Specifications
Specification Details
Factory HB Factory
Brand Design Hublot
Collection Big Bang Unico
Supplier Model Reference 421.OL.5180.RX
Product Type Replica watch
Case Diameter 45mm, according to supplier
Movement Supplier-described HUB 1280 automatic replica movement
Case Appearance Rose gold tone; base material and coating unspecified
Bezel Blue ceramic, according to supplier
Dial Blue skeletonized dial
Central Hands Hour and minute hands, plus an additional slim central hand
Subdials At 3 and 9 o’clock; working functions require confirmation
Date-Style Aperture Visible within the 3 o’clock subdial; operation unconfirmed
Crystal Sapphire crystal, according to supplier
Strap Blue rubber
Clasp Type Folding clasp
Clasp Appearance Supplier-described rose gold; composition unconfirmed
Water Resistance Factory-rated 10 ATM; not independently tested
Movement and Functions
Central Hour and Minute Hands

The shorter broad hand indicates the hours, while the longer broad hand indicates the minutes. Both feature rose gold tone borders with light-colored inserts.

Additionally, the outer track provides numbered reference points around the dial.

Slim Central Hand

A separate slim hand extends from the center toward the outer track. Its placement resembles a chronograph seconds hand, but the supplied information does not confirm its working function.

Subdial at 3 O’Clock

The right subdial features a blue background, contrasting markings and a “MIN” label. Its scale resembles a minute-counter layout.

A small aperture also appears inside this subdial near the right edge. However, the photograph does not clearly establish the displayed numeral or confirm date operation.

Subdial at 9 O’Clock

The left subdial contains a small hand above an open mechanical structure. Its position resembles a running-seconds display, although its actual function requires confirmation.

Crown and Pushers

Two rose gold tone pushers flank a crown with a dark textured grip. Together, they complete the chronograph-style appearance.

Before using these controls, request the correct instructions for the supplied movement. Working chronograph functions, flyback operation and power reserve remain unconfirmed.

Case and Dial
Rose Gold Tone Case

The case has a brushed rose gold tone appearance that contrasts with the blue components. The supplier describes its material as “Rose Gold” but does not specify the base metal, gold content or coating method.

Therefore, this page uses “rose gold tone” without claiming solid gold construction.

Blue Ceramic Bezel

According to the supplier, the bezel uses ceramic. The photograph shows a blue surface with exposed silver-tone screws, creating contrast against the case.

Blue Skeletonized Dial

The dial combines blue openwork with visible mechanical details. Arabic numerals and baton markers feature light-colored centers and rose gold tone borders.

Meanwhile, matching subdial surrounds connect the dial visually with the case. Portions of a numbered ring remain visible through the lower skeletonized area; these exposed numerals should not be confused with a separate confirmed date window.

Sapphire Crystal

The supplier lists sapphire crystal over the dial. No anti-reflective coating specification accompanies the provided information.

Strap and Clasp / Buckle

The blue rubber strap features longitudinal grooves and dark edges visible in the photograph. Its matching color continues the blue theme from the bezel to the wrist.

The supplier specifies a folding clasp described as rose gold. However, the photograph does not show the clasp, and its base material, coating and gold content remain unspecified.

Water Resistance

The factory lists a 10 ATM water-resistance rating. This rating has not undergone independent testing.

Accordingly, this listing does not guarantee suitability for swimming, showering or diving. Keep the watch dry unless a qualified watchmaker verifies its water resistance and advises on appropriate use.

Also, avoid operating the crown or pushers while the watch is wet.

Care Instructions
Clean the case, bezel and crystal with a soft cloth.
Avoid abrasive polishing products on the rose gold tone surfaces.
Keep the strap away from solvents and harsh chemicals.
Protect the ceramic bezel from impacts.
Avoid strong magnetic sources and extreme heat.
Follow the confirmed instructions for winding, setting and date adjustment.
Stop operating the crown or pushers if you feel unusual resistance.
Frequently Asked Questions
Is this an original Hublot watch?

No. This is an HB Factory replica with the supplier reference 421.OL.5180.RX. The HUB 1280 description does not mean it contains an original Hublot movement.

Is the case solid rose gold?

The supplier has not confirmed solid gold construction. Therefore, “rose gold tone” describes the appearance without guaranteeing gold content or a particular coating.

What size is this replica?

The supplier lists a case diameter of 45mm. This measurement has not undergone independent verification.

Does the chronograph work?

The watch has a chronograph-style layout with two subdials, an additional central hand and two pushers. However, the available specifications do not confirm their operation. Please request functional verification if stopwatch use is essential.

Where is the date display?

The photograph shows a date-style aperture inside the right subdial. Other numerals remain visible through the lower skeletonized area, but they do not establish a separate date window.

The actual date function requires confirmation.

Can I swim with this watch?

The factory claims 10 ATM, but the rating has not undergone independent testing. Therefore, we do not guarantee swimming suitability.

Will I receive QC videos before shipping?

Yes. After the watch arrives from the factory, our team inspects it and checks the movement. We then provide two QC videos.

Once you confirm the model and your shipping information, we arrange shipment.

Please identify the merchant when purchasing to prevent buying counterfeit HB Factory product

Welcome to the Clean Factory Watch.We specialize in offering high-quality replica watches that combine exceptional craftsmanship with reasonable pricing. All products are photographed in real life to ensure accurate descriptions, helping you make informed and confident purchasing decisions. Please note that our watches do not come with original brand boxes, but they can be purchased separately if needed.

We place great importance on each customer’s shopping experience. Every watch is guaranteed to match the version from the selected factory, with absolutely no bait-and-switch. Before shipping, we provide a complete video package including movement testing and actual product display to ensure accuracy. If you need specific details confirmed, we’re happy to take custom photos upon request. Our commitment is to always offer you the latest and most up-to-date replica watch models.

Please keep in mind that replica watches are not genuine and may not meet the extremely high standards of perfectionists. If you are highly particular about fine details, please carefully consider whether this type of product is suitable for you. Additionally, due to the sensitive nature of replica watches, our return and exchange process is relatively complex. We kindly ask that you read and accept our policies before making a purchase.

Thank you very much for your trust and support — happy shopping!