BBF Hublot Spirit of Big Bang Titanium Blue Ceramic 42MM
A highly technical replication of Hublot’s tonneau chronograph, featuring accurate ceramic blasting and skeletonized dial architecture.
Powered by Clone HUB 4700
The mechanical engine of this replica is a heavily modified Asian 7750, re-engineered visually to serve as the Clone HUB 4700. Extensive work has been done to skeletonize the top plates and integrate the custom date wheel, which is visible around the perimeter of the dial. While it lacks the high-beat 36,000 vph escapement of the genuine Zenith El Primero base, operating instead at 28,800 vph, it maintains full functional parity for all chronograph sub-dials and timekeeping elements.
⏱ Accuracy Profile:
Standard regulation for this A7750-based clone caliber typically yields ±10–15 seconds per day. The chronograph module engages with a firm click, characteristic of cam-actuated mechanisms.
- ✅ Power Reserve: Approximately 36 hours
- ✅ Complications: 12-hour chronograph, 30-minute counter, running seconds, skeletonized date
- ✅ Winding Direction: Unidirectional (clockwise)
Technical Specifications
THE BUILDGrade 5 Titanium
The 42mm tonneau case utilizes the signature Hublot sandwich construction, featuring alternating brushed and polished facets. Lateral inserts and precise lug geometry ensure the strap integrates seamlessly into the chassis.
THE DIALSapphire Skeleton
A transparent sapphire base reveals the movement below. Applied markers and sub-dial rings feature matte blue accents. The custom skeletonized date wheel rotates visibly, passing over a white background at 4:30 for contrast.
THE BEZELMicro-blasted Ceramic
The blue ceramic bezel features a matte, micro-blasted finish that resists fingerprints and scratches. It is secured by six polished, H-shaped titanium screws set flush into the ceramic.
THE BRACELETStructured Rubber
A high-grade blue structured rubber strap conforms closely to the wrist. It is secured by a titanium deployant buckle with twin-trigger release, offering crisp mechanical action.
Why BBF for This Reference?
Many collectors ask: “Why not ZF?”
While ZF produces excellent standard Big Bang models, BBF currently holds the edge for the Spirit of Big Bang series. BBF’s primary advantage lies in the dial depth and the specific micro-blasted texture of the blue ceramic bezel, which avoids the overly glossy appearance found on lesser batches. The alignment of the skeletonized date wheel is also notably more consistent on the BBF release.
Full Disclosure: Because the clone movement is based on the A7750 rather than a true Zenith El Primero clone, the central seconds hand sweeps at 28,800 vph instead of 36,000 vph, and the unidirectional winding rotor can be audibly loud during daily wear.
Data Sheet
| MODEL REFERENCE |
642.NM.0170.RX |
| FACTORY / VERSION |
BBF Edition |
| MOVEMENT |
Clone HUB 4700 (A7750 Base) |
| CASE MATERIAL |
Grade 5 Titanium with Ceramic Bezel |
| WEIGHT & THICKNESS |
~135g | 14.1mm |
| CRYSTAL & LUME |
Sapphire with AR | Super-LumiNova |
| DIMENSIONS |
42.0mm × 51.5mm × 14.1mmManual measurements — minor tolerances apply. |
| WATER RESISTANCE |
30m stated — professional pressure test recommended before swimming |
Collector Q&A
Q: Does the chronograph function work exactly like the genuine HUB 4700?
A: Yes, the chronograph is fully functional, recording seconds, minutes, and hours. However, because the BBF clone utilizes an Asian 7750 base rather than a Zenith El Primero base, the central seconds hand sweeps at 28,800 vph (8 ticks per second) instead of the genuine’s 36,000 vph (10 ticks per second).
Q: How accurate is the blue ceramic bezel color on the BBF version?
A: BBF has achieved a highly accurate micro-blasted finish on the ceramic. Under natural light, it matches the genuine’s matte navy tone closely, avoiding the overly glossy or purple hues sometimes seen on lower-tier replicas.
Q: Is the date wheel skeletonized like the authentic piece?
A: Yes, the custom date wheel is fully skeletonized and visible around the perimeter of the sapphire dial. It passes over a solid contrasting background at the 4:30 position to ensure legibility when reading the date.
Q: What is the most notable flaw on this BBF Spirit of Big Bang?
A: The primary limitation is movement noise. The unidirectional winding rotor of the modified A7750 base is audibly louder than the genuine movement. Additionally, the clone movement dictates a slightly thicker overall case profile compared to the retail model.
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