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Description
ZF Tudor Black Bay GMT Opaline m79830rb-0010
ZF sets the benchmark for the white-dial GMT by mastering the subtle metallic sheen of the opaline finish and integrating a fully functional jumping-hour complication.
Powered by Custom Asian True GMT Caliber
The mechanical core of this replica is a modified Asian automatic movement designed specifically to mimic the functionality of the Tudor MT5652. Unlike standard GMT clones that adjust the 24-hour hand, this caliber allows the user to independently jump the local 12-hour hand forward or backward in one-hour increments. This jumping action is directly linked to the date wheel, ensuring seamless time-zone transitions. Each movement is subjected to to verify the integrity of the jumping hour mechanism and amplitude stability.
Regulated to perform within ±10–15 seconds per day, consistent with high-grade modified Asian mechanical calibers.
- ✅ Power Reserve: Approximately 36 hours
- ✅ Complications: Independent jumping local hour, 24-hour GMT indication, linked date
- ✅ Winding Direction: Bidirectional
Technical Specifications
Measuring exactly 41mm in diameter with a robust 14.6mm thickness, the case faithfully replicates the slab-sided profile of the genuine. It features a high-polish finish on the flanks and a fine sand-brushed finish across the top lugs.
The dial exhibits a faint metallic galvanic luster rather than a flat matte white. The iconic snowflake hands and hour markers feature darkened, blackened edges to maximize contrast against the bright backdrop, filled with Super-LumiNova.
A 48-click bidirectional bezel fitted with a matte burgundy and deep blue aluminum insert. The non-ceramic material ensures the correct vintage aesthetic and light-play characteristic of classic aviation watches.
A three-link stainless steel bracelet featuring faux-rivet heads on the stepped links. It secures via a traditional fold-over safety clasp, accurately omitting the T-fit micro-adjustment system per the genuine reference.
Why ZF for This Reference?
Many collectors ask: ‘Why not other factories?’
ZF is the undisputed leader for the opaline dial variant because they correctly identified and reproduced the galvanic electroplating process. Competing factories often produce dials that are stark, flat white, entirely missing the subtle silvery warmth of the genuine Tudor dial. Furthermore, ZF’s anodization of the aluminum bezel achieves the precise matte texture and color saturation required for the burgundy and blue segments.
Full Disclosure: The Asian clone True GMT movement, while functionally accurate, can exhibit a stiffer setting action when jumping the local hour hand compared to the buttery smooth feel of the genuine MT5652 caliber.
Data Sheet
| MODEL REFERENCE | m79830rb-0010 |
| FACTORY / VERSION | ZF Edition |
| MOVEMENT | Custom Asian True GMT Caliber |
| CASE MATERIAL | 316L Stainless Steel |
| WEIGHT & THICKNESS | 180g | 14.6 mm |
| CRYSTAL & LUME | Domed Sapphire with AR | Super-LumiNova |
| DIMENSIONS | 41 mm × 180g × 14.6 mmManual measurements — minor tolerances apply. |
| WATER RESISTANCE | Stated 30m — professional pressure test recommended before swimming |
Collector Q&A
Q: Is the dial pure white or off-white?
A: It is an opaline silver-white. ZF has meticulously replicated the faint metallic galvanic electroplating luster of the genuine dial, avoiding a flat or stark white appearance.
Q: Does the GMT hand function like the genuine Tudor MT5652?
A: Yes, this model utilizes a ‘True GMT’ clone movement. The local hour hand jumps independently in one-hour increments forward or backward, and drives the date wheel, exactly like the genuine caliber.
Q: Does this bracelet include the T-fit micro-adjustment clasp?
A: No. True to the genuine m79830rb-0010 reference, this model uses the traditional fold-over safety clasp on a rivet-style bracelet, not the newer T-fit system found on models like the BB58 Bronze or Pro.
Q: Are there any known reliability issues with this specific GMT movement?
A: While the jumping hour functionality is highly accurate, the underlying Asian clone GMT movement can have a stiffer setting action compared to genuine. We recommend adjusting the independent hour hand slowly to avoid unnecessary stress on the date-change mechanism.
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