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Description
HBF Edition Hublot Big Bang Original Steel 44mm 301.SX.130.RX
A technically proficient execution of the classic 44mm Big Bang, characterized by precise vertical bezel brushing and a reliable high-beat chronograph architecture.
Powered by Asian 7750 Valjoux Clone
The engine driving this replica is the widely utilized Asian 7750 automatic chronograph movement, modified aesthetically to resemble the Hublot HUB4100 caliber. Operating at 28,800 vibrations per hour, the movement provides a smooth, continuous sweep for the chronograph seconds hand. HBF has notably upgraded the transfer gears within the chronograph module, mitigating some of the historical fragility associated with early A7750 iterations. The sub-dial spacing at 3, 6, and 9 o’clock aligns correctly with the genuine dial layout.
Standard ETA/clone base movements typically perform within ±10–15 seconds per day. The high-beat escapement maintains stable amplitude, though positional variance is slightly higher than premium Dandong calibers.
- ✅ Power Reserve: Approximately 36 hours
- ✅ Complications: 12-hour chronograph, 30-minute counter, running seconds, and quickset date
- ✅ Winding Direction: Unidirectional (clockwise rotor freewheeling)
Technical Specifications
Features the signature multi-part “Sandwich” case construction with black composite resin lateral inserts. The verified thickness of 15.7mm and weight of 156.3g provide a substantial, accurate wrist presence.
Accurately replicates the genuine stamped texture rather than using woven carbon fiber. Rhodium-plated appliques and hands are cleanly finished and treated with even white luminescent compound.
The bezel exhibits sharp, uniform vertical brushing that catches light dynamically, secured by six polished H-shaped titanium screws seated flush with the steel surface.
Constructed from pliable, scent-free rubber with the correct tire-tread pattern. The steel deployant clasp operates with firm engagement and minimal lateral play.
Why HBF for This Reference?
Many collectors ask: “Why not V6F or WWF?”
While V6F historically dominated the Big Bang market, their availability has become highly inconsistent. HBF has stepped in as the premier alternative, offering superior reinforcement on the A7750 chronograph engagement gears and exceptionally sharp vertical brushing on the bezel that rivals or exceeds older V6F batches.
Full Disclosure: The unidirectional winding rotor of the Asian 7750 produces the classic “wobble” and is audibly louder during rapid wrist movements compared to the genuine ETA-based HUB4100 caliber.
LIVE PREVIEW
Data Sheet
| MODEL REFERENCE | 301.SX.130.RX |
| FACTORY / VERSION | HBF Edition |
| MOVEMENT | Asian 7750 Valjoux Clone |
| CASE MATERIAL | 316L Stainless Steel |
| WEIGHT & THICKNESS | 156.3g | 15.7mm |
| CRYSTAL & LUME | Sapphire with Double AR | White Luminescent |
| DIMENSIONS | 44.0mm × 52.5mm × 15.7mmManual measurements — minor tolerances apply. |
| WATER RESISTANCE | 30m Stated — professional pressure test recommended before swimming |
Collector Q&A
Q: How does the HBF Asian 7750 movement compare to the genuine HUB4100?
A: The genuine HUB4100 is based on a modified ETA 7753. The HBF utilizes an Asian 7750 clone operating at 28,800bph. While the sub-dial spacing and chronograph functionality are accurate, the replica’s rotor winding noise is slightly more pronounced due to the unidirectional freewheeling nature of the A7750.
Q: Is the dial made of actual woven carbon fiber?
A: No. Consistent with the genuine 301.SX.130.RX reference, the dial features a stamped carbon-effect texture rather than a woven carbon-fiber plate. HBF replicates this stamped depth and matte finish accurately.
Q: Are the bezel screws interchangeable with genuine Hublot parts?
A: While the 6 H-shaped titanium screws are visually accurate and polished correctly to sit flush with the bezel, the threading tolerances and internal dimensions differ slightly from genuine specifications. Swapping with OEM screws is not recommended without modification.
Q: What is the known quirk regarding the chronograph operation on this model?
A: As with all Asian 7750 clone movements, it is critical not to adjust the quickset date when the time is set between 10:00 PM and 2:00 AM. Doing so engages the date driving mechanism and can severely damage the date wheel and chronograph engagement gears.
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