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Tudor Black Bay GMT Specifications
| Reference | M79830RB-0001, M79830RB-0012 |
|---|---|
| Case Size | 41mm |
| Lug Width | 22mm |
| Lug-to-Lug | 50mm |
| Thickness | 14.8mm |
| Case Material | stainless steel |
| Crystal | sapphire with anti-reflective coating |
| Water Resistance | 200m |
| Movement | MT5652 (automatic (GMT)) |
| Bezel | bidirectional rotating GMT bezel (blue/red Pepsi) |
| Crown | screw-down |
| Case Back | screw-down (solid steel) |
| Price Range | $4,100-$4,400 |
Compatible Straps for the Tudor Black Bay GMT
The Black Bay GMT uses a 22mm Lug Width and is compatible with the following strap types.
| Type | Recommended Brand | Why It Works | Price Range | Link |
|---|---|---|---|---|
| NATO/ZULU | Tudor OEM | Classic look, easy to swap, fits 22mm lugs | $15–$80 | |
| leather | Erika's Originals | Dresses up the watch, fits 22mm lugs | $15–$80 | |
| rubber/silicone | Barton | Water-resistant, comfortable for daily wear | $15–$80 | |
| OEM stainless steel bracelet | Delugs | Compatible with 22mm attachment | $15–$80 | |
| OEM fabric strap | Veblenist | Compatible with 22mm attachment | $15–$80 |
Replacement Parts for the Tudor Black Bay GMT
| Part | Description | Compatibility Note |
|---|---|---|
| crystal | Protective cover over the dial | Fits 41mm case |
| bezel insert (blue/red) | Outer ring marking | Matches bidirectional rotating GMT bezel (blue/red Pepsi) configuration |
| crown | Time-setting knob on case side | screw-down type |
| spring bars | Pins that hold the strap to the case | 22mm, 1.5mm diameter recommended |
| bracelet clasp | Replacement component | Check compatibility with Black Bay GMT |
| case back gasket | Seal that maintains water resistance | Required for 200m WR rating |
Modding the Tudor Black Bay GMT
The Black Bay GMT is a popular platform for modding. Here are the most common modifications.
- strap swap — Upgrade to a premium aftermarket strap or metal bracelet.
- OEM bracelet to NATO or leather — Upgrade to a premium aftermarket strap or metal bracelet.
Frequently Asked Questions
What lug width is the Tudor Black Bay GMT?
The Black Bay GMT has a 22mm lug width.
Is the Black Bay GMT bezel bidirectional?
Yes. Unlike standard dive watches with unidirectional bezels, the Black Bay GMT has a bidirectional 24-hour bezel for tracking a second time zone.
Can the GMT hand be set independently?
Yes. The MT5652 movement features a true GMT function with an independently adjustable local hour hand, making it a 'caller' or 'flyer' GMT.