Tudor Black Bay 58 GMT 7939G1A0NRU-0001
Ref. 7939G1A0NRU-0001 · Black dial · In production
- Case39 mm
- Thick12.8 mm
- Water res.200 m
- MovementAutomatic
- CrystalSapphire
Tudor Black Bay 58 GMT 7939G1A0NRU-0001 size, specs and price at a glance
The Tudor Black Bay 58 GMT 7939G1A0NRU-0001 is 39 mm wide and 12.8 mm thick. Tudor does not publish its lug-to-lug length. It takes 20 mm straps and ships on a bracelet. Inside is the MT5450-U automatic calibre, water resistant to 200 m.
Strap shopping? See our Tudor lug width chart.
Overview
The Tudor 7939G1A0NRU-0001 is a gmt watch from the Black Bay 58 collection, part of the Black Bay 58 GMT family. It has a 39 mm stainless steel case, 12.8 mm thick. Tudor lists the dial as black. Inside is an automatic movement (calibre MT5450-U) with 65 h of power reserve. You also get 200 m water resistance, a sapphire crystal and a bracelet.
Who it suits
- Wrists of roughly 15.5–17.4 cm (6.1–6.9 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
Written by Watch.co from the published specs below. These are not owner reviews.
Full specifications
Case
| Case diameter | 39 mm | tudorwatch.com · 3 Nov 2026 |
|---|---|---|
| Thickness | 12.8 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 | Black | 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 | MT5450-U | tudorwatch.com · 3 Nov 2026 |
| Power reserve | 65 h | tudorwatch.com · 3 Nov 2026 |
| Certification | METAS Master Chronometer | tudorwatch.com · 3 Nov 2026 |
Strap / Bracelet
| Bracelet / strap | Bracelet | tudorwatch.com · 3 Nov 2026 |
|---|---|---|
| Lug width | 20 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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Guides and comparisons
Questions about the Tudor Black Bay 58 GMT 7939G1A0NRU-0001
How big is the Tudor Black Bay 58 GMT 7939G1A0NRU-0001?
The case is 39 mm wide, 12.8 mm thick.
What movement does the Tudor Black Bay 58 GMT 7939G1A0NRU-0001 use?
It uses the MT5450-U calibre, a automatic movement with 65 h of power reserve.
Can I swim with the Tudor Black Bay 58 GMT 7939G1A0NRU-0001?
Yes. It is rated to 200 m.
Does the Tudor Black Bay 58 GMT 7939G1A0NRU-0001 have a date?
Yes, it shows the date.
Will the Tudor Black Bay 58 GMT 7939G1A0NRU-0001 fit my wrist?
By our sizing guide it sits best on wrists of about 15.5–17.4 cm (6.1–6.9 in). Use the fit checker on this page to test your own wrist.
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