Tudor Black Bay GMT 79830RB-0012
Ref. 79830RB-0012 · Domed opaline dial · In production
- Case41 mm
- Thick14.6 mm
- Water res.200 m
- MovementAutomatic
- CrystalSapphire
Tudor Black Bay GMT 79830RB-0012 size, specs and price at a glance
The Tudor Black Bay GMT 79830RB-0012 is 41 mm wide and 14.6 mm thick. Tudor does not publish its lug-to-lug length. It takes 22 mm straps and ships on a fabric strap. Inside is the MT5652 automatic calibre, water resistant to 200 m.
Strap shopping? See our Tudor lug width chart.
Overview
The Tudor 79830RB-0012 is a gmt watch from the Black Bay Gmt collection, part of the Black Bay GMT family. It has a 41 mm stainless steel case, 14.6 mm thick. Tudor lists the dial as domed opaline. Inside is an automatic movement (calibre MT5652) with 70 h of power reserve. You also get 200 m water resistance, a sapphire crystal and a fabric strap.
Who it suits
- Wrists of roughly 16.4–18.3 cm (6.4–7.2 in), by our Watch Finder sizing guide
- Swimming, snorkelling and diving
- Frequent travellers who track two time zones
Strengths
- Sapphire crystal resists scratches
- 200 m water resistance
- Screw-down crown helps keep water out
- 70 h power reserve survives a weekend off the wrist
Trade-offs
- Thick at 14.6 mm: harder to slide under a cuff
Written by Watch.co from the published specs below. These are not owner reviews.
Full specifications
Case
| Case diameter | 41 mm | tudorwatch.com · 3 Nov 2026 |
|---|---|---|
| Thickness | 14.6 mm | tudorwatch.com · 3 Nov 2026 |
| Lug-to-lug | Not published by Tudor | |
| Case material | Stainless steel | tudorwatch.com · 3 Nov 2026 |
| Crystal | Sapphire | tudorwatch.com · 3 Nov 2026 |
| Bezel | Bidirectional rotating | tudorwatch.com · 3 Nov 2026 |
| Water resistance | 200 m | tudorwatch.com · 3 Nov 2026 |
| Screw-down crown | Yes | tudorwatch.com · 3 Nov 2026 |
Dial
| Dial colour | Domed opaline | tudorwatch.com · 3 Nov 2026 |
|---|---|---|
| Date | Date | tudorwatch.com · 3 Nov 2026 |
| GMT / second time zone | Yes | tudorwatch.com · 3 Nov 2026 |
Movement
| Movement type | Automatic | tudorwatch.com · 3 Nov 2026 |
|---|---|---|
| Calibre | MT5652 | tudorwatch.com · 3 Nov 2026 |
| Power reserve | 70 h | tudorwatch.com · 3 Nov 2026 |
| Certification | COSC chronometer | tudorwatch.com · 3 Nov 2026 |
Strap / Bracelet
| Bracelet / strap | Fabric strap | tudorwatch.com · 3 Nov 2026 |
|---|---|---|
| Lug width | 22 mm | tudorwatch.com · 3 Nov 2026 |
Other
| Production status | In production | tudorwatch.com · 3 Nov 2026 |
|---|---|---|
| Style (our classification) | GMT | our classification |
Specs are summarised in our own words from the brand's product page. Each row links its source and the date we checked it. Fields we haven't verified are left out rather than guessed.
Variants with the same specs
Same case, movement and bracelet or strap; typically a different dial or finish.
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Tudor Black Bay GMT 79830RB-0010
Tudor Black Bay GMT S&G 79833MN-0001
Tudor Black Bay GMT S&G 79833MN-0003
Tudor Black Bay GMT S&G 79833MN-0004
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Questions about the Tudor Black Bay GMT 79830RB-0012
How big is the Tudor Black Bay GMT 79830RB-0012?
The case is 41 mm wide, 14.6 mm thick.
What movement does the Tudor Black Bay GMT 79830RB-0012 use?
It uses the MT5652 calibre, a automatic movement with 70 h of power reserve.
Can I swim with the Tudor Black Bay GMT 79830RB-0012?
Yes. It is rated to 200 m.
Does the Tudor Black Bay GMT 79830RB-0012 have a date?
Yes, it shows the date.
Will the Tudor Black Bay GMT 79830RB-0012 fit my wrist?
By our sizing guide it sits best on wrists of about 16.4–18.3 cm (6.4–7.2 in). Use the fit checker on this page to test your own wrist.
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