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Description
ZF Factory Tudor Black Bay GMT Pepsi M79830RB-0001
The definitive 1:1 replication of Tudor’s classic dual-time diver, distinguished by its highly accurate anodized aluminum bezel and jumping hour functionality.
Powered by Custom Asian Automatic GMT Caliber
At the core of this reference is a sophisticated custom Asian GMT mechanical movement designed to replicate the operational feel of the genuine MT5652. The architecture allows for independent adjustment of the local hour hand, which jumps in one-hour increments to set the time and drive the date wheel forward or backward across the midnight threshold. Every caliber is evaluated against to ensure the jumping hour mechanism engages precisely and the hand stack clearances are maintained.
Regulated to perform within ±10–15 seconds per day, consistent with high-grade Asian clone base movements.
- ✅ Power Reserve: Approximately 36 hours
- ✅ Complications: True jumping local hour hand, linked date wheel, independent 24-hour GMT tracking
- ✅ Winding Direction: Bidirectional automatic winding
Technical Specifications
Measuring exactly 41mm in diameter with a robust 14.6mm thickness, the case features polished slab sides and fine linear brushing on the upper lugs, yielding a heavy 186g presence on the wrist.
The dial avoids glossy finishes, utilizing a period-correct matte texture. It hosts pure white Super-LumiNova® markers with silver borders and the iconic Snowflake hand set, including a matte red GMT indicator.
A 48-click bidirectional stainless steel bezel houses the signature matte burgundy and deep blue aluminum insert, deliberately avoiding ceramic to maintain the watch’s mid-century aesthetic.
The 22mm bracelet features stepped rivet heads on the outer links, paying homage to 1950s Tudor dive bracelets. True to this specific genuine reference, it utilizes a standard fold-over clasp without T-fit micro-adjustment.
Why ZF Factory for This Reference?
Many collectors ask: “Why not Born Factory or other alternatives?”
ZF remains the undisputed benchmark for the Black Bay line due to their proprietary bezel anodizing process. Rival factories frequently struggle with the burgundy tone, rendering it either too bright or overly metallic. ZF achieves the exact muted, matte wine-red and deep navy blue found on the genuine M79830RB-0001, combined with superior domed sapphire crystal clarity that minimizes edge distortion.
Full Disclosure: The custom Asian GMT movement can exhibit slightly more audible rotor winding noise than the genuine caliber, and the machined edges of the faux rivets on the bracelet can feel slightly sharper than OEM tolerances.
Data Sheet
| MODEL REFERENCE | M79830RB-0001 |
| FACTORY / VERSION | ZF Factory Edition |
| MOVEMENT | Custom Asian Automatic GMT Caliber |
| CASE MATERIAL | 316L Stainless Steel |
| WEIGHT & THICKNESS | 186g (full links) | 14.6mm |
| CRYSTAL & LUME | Domed Sapphire Crystal | Super-LumiNova® |
| DIMENSIONS | 41mm × 22mm lug width × 14.6mmManual measurements — minor tolerances apply. |
| WATER RESISTANCE | 50m daily life waterproof — professional pressure test recommended before swimming |
Collector Q&A
Q: Is the bezel insert ceramic or aluminum?
A: Consistent with the genuine Tudor M79830RB-0001, the ZF edition utilizes an anodized aluminum insert. This material choice is intentional, perfectly capturing the matte, retro texture and nuanced burgundy/deep blue color transition that ceramic cannot replicate.
Q: How does the GMT function operate on this movement?
A: The custom Asian automatic GMT movement features a jumping local hour hand. When you unscrew the crown to the first position, the hour hand jumps in one-hour increments, which also drives the date wheel forward or backward, faithfully mimicking the genuine MT5652 caliber.
Q: Will genuine Tudor straps fit this case?
A: Yes. The case features a highly accurate 22mm lug width and standard spring bar hole placement. You can seamlessly install OEM Tudor fabric NATOs, leather straps, or aftermarket rubber options designed for the 41mm Black Bay case.
Q: Are there any known technical quirks with the ZF GMT?
A: While the ZF edition is structurally excellent, the custom Asian GMT movement can exhibit slightly more rotor winding noise than the genuine manufacture caliber. Additionally, the faux rivet heads on the bracelet links may have slightly sharper machined edges compared to the softer finish of an authentic Tudor bracelet.
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