This replica big bang 5170 blue pairs the 421.NL.5170.RX reference with a vivid blue dial and matching rubber strap, giving the Big Bang a distinctly nautical edge that most versions in the series do not attempt. Hublot built the Big Bang around the concept of material fusion, and this 44mm interpretation pushes that idea by matching a textured blue dial with a microblasted case and polished bezel ring. The blue rubber strap integrates flush with the lugs using the brand’s signature screw-down attachment system, and the overall silhouette keeps the same angular profile that defines every Big Bang variation. The linen-pattern dial surface catches light differently than a flat sunburst finish, creating subtle shifts in tone between direct and angled viewing.

Build Details

• Case diameter: 44mm
• Reference: 421.NL.5170.RX
• Dial: textured blue with applied indices
• Bezel: six H-shaped titanium screws
• Crystal: sapphire with anti-reflective coating
• Strap: structured blue rubber with deployant clasp
• Movement: automatic

The blue colorway extends across dial, strap, and stitching, creating a monochromatic effect that few Big Bang models achieve this consistently.

What Collectors Notice

The 5170.RX differs from standard Big Bang references primarily through its dial texture. Where most models use flat or skeletal dials, this one employs a fabric-weave pattern that reads as deep navy in low light and electric blue under direct illumination. The H-screws on the bezel maintain polished tops against a brushed bezel surface. For a different material approach within the range, the 301.SX.130.RX in steel shows how the same case architecture translates without color emphasis. Both sit in the Big Bang collection, but they target distinctly different tastes.

This vs Other Versions

Blue-dial Big Bangs occupy a niche between the more common black variants and the louder gold editions. The 44mm case diameter provides substantial wrist presence without crossing into the oversized territory of 45mm Unico models. The rubber strap keeps daily weight manageable and allows quick swaps if you prefer a different color pairing down the line. This replica big bang 5170 blue represents the kind of cohesive color commitment that sets specific references apart from the broader catalog.