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Description
ZF Tudor Black Bay Bronze “Slate Grey” M79250BA-0001
The industry standard for the 43mm Bronze Black Bay, praised for its chemically accurate aluminum bronze alloy and exceptional gradient dial execution.
Powered by Asian Custom Seagull 2824
This model is driven by the highly dependable Asian custom Seagull 2824 automatic mechanical movement. Chosen for its robust architecture and low maintenance costs, it beats at 28,800 vibrations per hour, ensuring a seamless sweep of the iconic snowflake seconds hand. Unlike proprietary clone movements that can be challenging to service, the Seagull 2824 accepts standard ETA-compatible parts, making long-term ownership straightforward. Every piece is regulated prior to dispatch to meet for amplitude and beat error.
Standard clone base movements typically perform within ±10–15 seconds per day out of the factory, though the Seagull 2824 can often be regulated to tighter tolerances by a competent watchmaker.
- ✅ Power Reserve: Approximately 36 hours
- ✅ Complications: Time-only display (no ghost date position on properly modified variants)
- ✅ Winding Direction: Bidirectional automatic winding
Technical Specifications
The 43mm case measures approximately 14.6mm thick with a unique 23mm lug width. The caseback utilizes PVD bronze-plated stainless steel to prevent skin discoloration, identical to the genuine design.
A matte, slightly domed dial featuring a subtle gradient from lighter slate grey at the center to a darker perimeter. Features vintage 3-6-9 Arabic numerals and heavy Super-LumiNova application.
A slate grey anodized aluminum insert sits atop a 60-click unidirectional stainless steel bezel core, offering a crisp, tactile ratcheting action with minimal back-play.
Supplied with either a distressed vintage leather strap or a slate grey jacquard fabric strap, both terminating in an aluminum bronze pin buckle matching the case alloy.
Why ZF for This Reference?
Many collectors ask: “Why not XF?”
While XF previously produced a highly competent Bronze Black Bay, ZF remains the definitive choice for the slate grey M79250BA-0001 due to their superior dial gradient execution and alloy stability. The ZF transition from the center dial to the outer edge is noticeably smoother than early XF batches, and the aluminum bronze case patinas to a rich, dark brown rather than the rapid, powdery green verdigris seen on lower-tier brass cases.
Full Disclosure: The Asian Seagull 2824 rotor can occasionally exhibit slight winding noise in quiet environments, and the historically accurate 23mm lug width makes sourcing aftermarket strap options somewhat challenging.
Data Sheet
| MODEL REFERENCE | M79250BA-0001 |
| FACTORY / VERSION | ZF Edition |
| MOVEMENT | Asian Custom Seagull 2824 Automatic |
| CASE MATERIAL | Aluminum Bronze Alloy |
| WEIGHT & THICKNESS | 100 g | 14.6 mm |
| CRYSTAL & LUME | Domed Sapphire | Super-LumiNova® |
| DIMENSIONS | 43 mm × 14.6 mmManual measurements — minor tolerances apply. |
| WATER RESISTANCE | 50m stated rating — professional pressure test recommended before swimming |
Collector Q&A
Q: Will the ZF aluminum bronze case turn my wrist green?
A: No. ZF utilizes an accurate aluminum bronze alloy rather than standard brass. This alloy develops a dark, oxidized patina over time without producing the powdery green verdigris (copper carbonate) seen on cheaper replicas. Additionally, the caseback is PVD-plated stainless steel specifically to prevent direct skin contact with the bronze.
Q: How accurate is the gradient effect on the slate grey dial?
A: The ZF dial excellently captures the genuine’s transition from a lighter slate grey at the center to a near-black outer edge. The matte finish and domed profile closely mirror the retail M79250BA-0001, avoiding the overly abrupt color transitions seen in earlier iterations from competing factories.
Q: Can I fit standard 22mm straps on this model?
A: No. The Black Bay Bronze 43mm features a unique 23mm lug width. You must source specific 23mm straps to ensure a proper fit; attempting to use standard 22mm or 24mm straps will either expose the spring bars or pinch the leather uncomfortably.
Q: Is the Asian Seagull 2824 movement noisy in this case?
A: As with many Asian 2824 clones, the automatic winding rotor can exhibit a slight ‘whirring’ noise in a quiet room. This is a known characteristic of the movement’s reversing wheel system and does not affect the timekeeping stability or reliability of the watch.
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