Tudor Black Bay One 36 79640-0001
Ref. 79640-0001 · Anthracite dial · In production
- Case36 mm
- Thick10.5 mm
- Water res.100 m
- MovementAutomatic
- CrystalSapphire
Tudor Black Bay One 36 79640-0001 size, specs and price at a glance
The Tudor Black Bay One 36 79640-0001 is 36 mm wide and 10.5 mm thick. Tudor does not publish its lug-to-lug length. It takes 19 mm straps and ships on a bracelet. Inside is the MT5400 automatic calibre, water resistant to 100 m.
Strap shopping? See our Tudor lug width chart.
Overview
The Tudor 79640-0001 is a sports watch from the Black Bay One collection, part of the Black Bay One 36 family. It has a 36 mm stainless steel case, 10.5 mm thick. Tudor lists the dial as anthracite. Inside is an automatic movement (calibre MT5400) with 70 h of power reserve. You also get 100 m water resistance, a sapphire crystal and a bracelet.
Who it suits
- Wrists of roughly 14.3–16.2 cm (5.6–6.4 in), by our Watch Finder sizing guide
- Everyday wear including swimming
- Shirt cuffs and smarter dress codes
Strengths
- Sapphire crystal resists scratches
- Screw-down crown helps keep water out
- 70 h power reserve survives a weekend off the wrist
- Slim at 10.5 mm
Written by Watch.co from the published specs below. These are not owner reviews.
Full specifications
Case
| Case diameter | 36 mm | tudorwatch.com · 3 Nov 2026 |
|---|---|---|
| Thickness | 10.5 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 |
| Water resistance | 100 m | tudorwatch.com · 3 Nov 2026 |
| Screw-down crown | Yes | tudorwatch.com · 3 Nov 2026 |
Dial
| Dial colour | Anthracite | tudorwatch.com · 3 Nov 2026 |
|---|---|---|
| Date | Date | tudorwatch.com · 3 Nov 2026 |
Movement
| Movement type | Automatic | tudorwatch.com · 3 Nov 2026 |
|---|---|---|
| Calibre | MT5400 | 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 | Bracelet | tudorwatch.com · 3 Nov 2026 |
|---|---|---|
| Lug width | 19 mm | tudorwatch.com · 3 Nov 2026 |
Other
| Production status | In production | tudorwatch.com · 3 Nov 2026 |
|---|---|---|
| Style (our classification) | Sports | 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.
Tudor Black Bay One 36 79640-0002
Tudor Black Bay One 36 79640-0003
Tudor Black Bay One 36 79640-0004
Tudor Black Bay One 36 79640-0005
Tudor Black Bay One 36 79640-0006
More in Black Bay One 36
Tudor Black Bay One 31 79600-0001
Tudor Black Bay One 31 79600-0002
Tudor Black Bay One 31 79600-0003
Tudor Black Bay One 31 79600-0004
Tudor Black Bay One 31 79600-0005
Tudor Black Bay One 31 79600-0006
Similar alternatives
Picked with Watch Finder's style tags and sizing.
Guides and comparisons
Questions about the Tudor Black Bay One 36 79640-0001
How big is the Tudor Black Bay One 36 79640-0001?
The case is 36 mm wide, 10.5 mm thick.
What movement does the Tudor Black Bay One 36 79640-0001 use?
It uses the MT5400 calibre, a automatic movement with 70 h of power reserve.
Can I swim with the Tudor Black Bay One 36 79640-0001?
Yes. It is rated to 100 m.
Does the Tudor Black Bay One 36 79640-0001 have a date?
Yes, it shows the date.
Will the Tudor Black Bay One 36 79640-0001 fit my wrist?
By our sizing guide it sits best on wrists of about 14.3–16.2 cm (5.6–6.4 in). Use the fit checker on this page to test your own wrist.
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