Hublot announced the Big Bang Unico Sky Blue on 3 May 2023: a 42 mm limited-edition ceramic flyback chronograph, reference 441.EX.5120.RX, with a stated 72-hour power reserve. Hublot said the edition was limited to 200 pieces. The details below describe the release as announced; they do not establish current stock or pricing.
What is the Hublot Big Bang Unico Sky Blue?
Reference 441.EX.5120.RX is Hublot’s 2023 Big Bang Unico Sky Blue, announced on 3 May 2023. The release describes a 42 mm watch with a light blue ceramic case and bezel and a skeletonized chronograph dial. Hublot’s launch announcement is the source for the model’s specifications and limited-edition quantity: Hublot’s release announcement.
Hublot’s promotional launch language called the watch “The Sky’s the Limit” and “Here comes the summer!” Those phrases describe the campaign, not an independent assessment of the watch’s performance.
Specifications announced by Hublot
| Specification | Release detail |
|---|---|
| Reference and announcement date | 441.EX.5120.RX; 3 May 2023, according to Hublot’s launch release. |
| Case size | 42 mm, according to Hublot’s 2023 release. |
| Case and bezel | Satin-finished and polished light blue ceramic, with six H-shaped titanium screws, according to Hublot’s 2023 release. |
| Dial and crystal | Matte Sky Blue skeleton dial; sapphire crystal with anti-reflective treatment, according to Hublot’s 2023 release. |
| Movement and chronograph | HUB1280 UNICO manufacture self-winding flyback chronograph with column wheel, according to Hublot’s 2023 release. |
| Power reserve | 72 hours, as stated by Hublot in 2023. |
| Water resistance | 100 m or 10 ATM, as stated by Hublot in 2023. This rating alone does not establish suitability for every water activity. |
| Straps and clasp | White and light blue lined rubber strap, plus an additional white calf leather strap with Velcro; titanium deployant buckle, according to Hublot’s 2023 release. |
| Edition | Limited to 200 pieces, according to Hublot’s 2023 release. The reviewed official sources do not establish an independent production or sales figure. |
Movement, materials and wear details
UNICO flyback chronograph
Hublot identifies the HUB1280 UNICO as a self-winding manufacture movement with a flyback chronograph and column wheel. The stated 72-hour power reserve is the brand’s specification; no independent performance test is established by the release.
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- WATER RESISTANT LADIES WATCH: Up to 100m (330ft): Suitable for bathing, swimming or snorkeling, but is not resistant enough to withstand scuba diving; 10 ATM
Ceramic case and skeleton dial
The case and bezel are specified as satin-finished and polished light blue ceramic. The dial is matte Sky Blue and skeletonized, while the crystal is sapphire with anti-reflective treatment. These are release specifications rather than independent durability or legibility findings.
Two strap configurations
The announcement lists a white and light blue lined rubber strap and an additional white calf leather strap secured with Velcro. It also specifies a titanium deployant buckle. The release does not verify current replacement-strap stock, fitment of later straps, or service availability.
Rank #2
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- The BOLD Fusion brings a bold, sporty case to retro-futurist design. This 44 mm chronograph watch features a blue sunray dial, ceramic bezel, Swiss Super-LumiNova accents, and a blue silicone strap.
- Water Resistant: Up to 50m (165ft): Wearable for short periods of recreational swimming and showering, but not diving or snorkeling; 5 ATM.
- Quartz Chronograph Movement: The quartz watch movement is powered by a battery. A chronograph watch type serves as both a stopwatch and a display watch. A basic chronograph features an independent sweep second hand that can be started, stopped, and returned to zero with successive pressure on the stem.
- Caring for Your Timepiece: Like any finely crafted mechanism, your Movado watch requires periodic maintenance to ensure optimal performance. A maintenance interval of 3 to 5 years is recommended, in addition to any required battery replacement. Never open the watch yourself.
Limited edition and availability
Hublot announced a 200-piece limited edition. At launch, the brand said the watch would be available through its e-boutique and 130 points of sale. That was launch-era distribution information, not confirmation of present inventory or the current number of outlets.
Current price, remaining inventory, active retailer authorization and Amazon availability are not established by the reviewed official materials. A search for the exact reference, 441.EX.5120.RX, is the clearest way to distinguish this model from watches with similar Sky Blue names; verify the reference and seller details directly before relying on a listing.
Rank #3
- PD-1644 Men's Quartz Watch: 40mm in diameter and 12mm in thickness, the case and bracelet are made of 316L stainless steel, finely polished to give a textured luster, both corrosion-resistant and sturdy, suitable for most men's wrists, the classic size of the watch takes into account the comfort of wearing and the sense of visual harmony.
- Japanese quartz movement: Equipped with the vk63 movement imported from Japan, this is a truly reliable and professional timepiece. Thanks to its high speed accuracy, you don't have to worry about time errors and are always up to date.
- The ceramic bezel is resistant to corrosion and scratches and will not fade even under UV light. Water-resistant to 100 meters, it can handle most emergencies. It is resistant to sweat, splashes or hand washing, but not to hot water. The synthetic sapphire crystal is extremely hard, so you don't have to worry about scratching your watch, and it has excellent light transmission.
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- WATERPROOF PERFORMANCE: With 100 meters waterproof rating, it can meet the waterproof needs of daily hand washing, swimming, etc. (Note: not applicable to diving or hot water environment), the sealed design effectively resists liquid intrusion and guarantees the stable operation of the movement.
Distinguishing this reference from later Sky Blue-named watches
Hublot’s official news archive separately records a Big Bang Unico Blue Ceramic Caribbean announcement dated 12 November 2025 and a Big Bang Sapphire Sky Blue announcement dated 8 July 2026. They are distinct models, not updates to the 2023 Big Bang Unico Sky Blue reference 441.EX.5120.RX. The archive dates and names are listed in Hublot’s news archive.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the release does—and does not—establish
Hublot’s announcement is useful for identifying the reference, its stated construction, movement, water-resistance rating, power reserve, strap configuration and edition size. It does not provide a comparative performance ranking, independent test results, current market value or evidence of current availability.
Quick Recap
Best Value
- Pagani Design This quartz watch is equipped with the Japanese Vk63 movement. In the watch industry, Vk63 is synonymous with greater stability, and the material is widely used in aerospace components and scalpels. It means high quality and harmlessness to the human body. The glass is made of synthetic sapphire. Sapphire is the hardest substance in nature apart from diamond and has unrivaled scratch resistance.
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Rank #4
- PAGANI DESIGN WATCHES: The case of this pagani design watch is made of stainless steel and is well-made. The stainless steel/rubber bracelet is very soft and comfortable to wear. It can be used forever after careful maintenance. The ceramic bezel and sapphire crystal mirror make the watch more upscale.
- MENS CHRONOGRAPH WATCH: Imported Japanese VK63 quartz movement, more accurate timing and longer service life; All the buttons of the watch can be used: lightly press the upper right button to make the large second hand work and pause, lightly press the lower right button to make the large second hand return to zero. This is a real chronograph watch.
- 100M WATERPROOF: Up to 100M waterproof allows you to easily face life, rain, face washing and swimming are no problem. But not recommended for diving and hot bathing; Luminous hands and mark (need to absorb light energy storage)
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
