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Description
BBF Hublot Spirit of Big Bang Titanium 42MM 642.NX.0170.RX
A technically proficient execution of Hublot’s complex tonneau architecture, backed by a heavily decorated A7750 chronograph caliber.
Powered by Modified Asian 7750
The engine driving this replica is the ubiquitous and robust Asian 7750 automatic chronograph, extensively modified to replicate the visual footprint of the genuine HUB4700. BBF has applied custom skeletonized top plates, a modified date wheel framework, and custom rotor engraving to mimic the Zenith El Primero-based genuine movement. While the underlying architecture remains a traditional cam-operated chronograph, the visual illusion achieved through the sapphire dial is highly commendable.
Standard A7750 clone base movements typically perform within ±10–15 seconds per day when fully wound. Regulation by a professional watchmaker can further tighten these tolerances.
- ✅ Power Reserve: Approximately 36 hours
- ✅ Complications: Center hours, minutes, running sub-seconds, date display, and 12-hour chronograph
- ✅ Winding Direction: Unidirectional (clockwise)
Technical Specifications
Machined from titanium to a verified thickness of 16.6mm and a total weight of 152.4g. Features alternating satin-brushed surfaces and micro-blasted recesses.
A transparent sapphire dial exposes the decorated movement below, featuring applied faceted indices and a floating date ring that passes over a contrasting background at 4:30.
Secured by six functional, polished H-shaped titanium screws. The bezel exhibits a precise vertical brush pattern with high-polish chamfered edges.
A high-grade black rubber strap integrated directly into the case lugs, secured by a titanium deployant buckle with precise push-button release mechanisms.
Why BBF for This Reference?
Many collectors ask: “Why not HBF or ZF?”
For the 642.NX.0170.RX, BBF provides superior skeletonized bridge decoration and a more accurate satin-brushed finish on the multi-part titanium mid-case. The verified weight of 152.4g demonstrates a solid build quality that avoids the hollow feel occasionally found in lower-tier versions.
Full Disclosure: The A7750 movement requires a case thickness of 16.6mm, which sits taller than the genuine Zenith-based HUB4700 caliber. Additionally, the unidirectional winding rotor produces noticeable noise during rapid wrist movement.
LIVE PREVIEW
Data Sheet
| MODEL REFERENCE | 642.NX.0170.RX |
| FACTORY / VERSION | BBF Edition |
| MOVEMENT | Modified Asian 7750 (HUB4700 Decoration) |
| CASE MATERIAL | Titanium |
| WEIGHT & THICKNESS | 152.4g | 16.6mm |
| CRYSTAL & LUME | Sapphire with AR Coating | Standard Super-LumiNova |
| DIMENSIONS | 42mm × Tonneau Profile × 16.6mmManual measurements — minor tolerances apply. |
| WATER RESISTANCE | Stated 30m — professional pressure test recommended before swimming |
Collector Q&A
Q: How does the thickness of the BBF Spirit of Big Bang compare to genuine?
A: The BBF edition measures exactly 16.6mm thick. The genuine HUB4700-powered model is approximately 14.1mm, meaning this A7750-based replica sits about 2.5mm taller on the wrist to accommodate the required chronograph module.
Q: Is the chronograph fully functional on this modified movement?
A: Yes, the Asian 7750 base provides a fully functioning chronograph with center seconds and running sub-dials. However, frequent use of the chronograph will significantly reduce the 36-hour power reserve.
Q: Are the H-screws on the bezel functional or purely decorative?
A: Like the genuine article, the H-shaped titanium screws on the bezel are functional and thread directly into the mid-case to secure the complex tonneau sandwich construction.
Q: What is the most noticeable visual or mechanical flaw on the BBF 642.NX.0170.RX?
A: The primary mechanical tell is the rotor noise inherent to the unidirectional winding of the A7750 movement, which is louder than the genuine Zenith El Primero-based caliber. Visually, the date wheel sits slightly deeper within the skeletonized framework compared to retail.
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