Tudor Black Bay 58 vs Black Bay 54
Tudor Black Bay 58 7939A1A0NU-0001 vs Tudor Black Bay 54 79000B-0001, compared on the specs each brand publishes.
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The short answer
Tudor's two smaller Black Bay divers, compared on Tudor's specs.
- Case size: the Tudor Black Bay 58 7939A1A0NU-0001 is 2 mm larger (39 mm vs 37 mm).
- Thickness: the Tudor Black Bay 58 7939A1A0NU-0001 is 0.5 mm thicker (11.7 mm vs 11.2 mm).
- Power reserve: the Tudor Black Bay 54 79000B-0001 is 5 hours longer (70 h vs 65 h).
- Calibre: Tudor Black Bay 58 7939A1A0NU-0001 has MT5400-U; Tudor Black Bay 54 79000B-0001 has MT5400.
- Certification: Tudor Black Bay 58 7939A1A0NU-0001 has METAS Master Chronometer; Tudor Black Bay 54 79000B-0001 has COSC chronometer.
Side-by-side specs
| Spec | Tudor Black Bay 58 7939A1A0NU-0001 | Tudor Black Bay 54 79000B-0001 |
|---|---|---|
| Case diameter | 39 mm | 37 mm |
| Thickness | 11.7 mm | 11.2 mm |
| Lug width | 20 mm | 20 mm |
| Calibre | MT5400-U | MT5400 |
| Movement | Automatic | Automatic |
| Power reserve | 65 h | 70 h |
| Water resistance | 200 m | 200 m |
| Crystal | Sapphire | Sapphire |
| Case material | Stainless steel | Stainless steel |
| Ships on | Bracelet | Bracelet |
| Dial | Matt black | Blue |
| Certification | METAS Master Chronometer | COSC chronometer |
| Status | In production | In production |
| Suits wrists of about our sizing guide | 15.5–17.4 cm | 14.7–16.6 cm |
Specs summarised in our own words from the brand's product pages: 7939A1A0NU-0001 source (checked 3 Nov 2026) 79000B-0001 source (checked 3 Nov 2026). "Not published" means the brand page we checked doesn't list it, so we leave it blank rather than guess.
Wrist fit
Lug-to-lug decides overhang more than diameter does. Enter your wrist to see how each one should wear.
- Tudor Black Bay 58 7939A1A0NU-0001 –
- Tudor Black Bay 54 79000B-0001 –
Same rule of thumb as Watch Finder: case diameter of about 23.5% of your wrist circumference (−2 mm to +2.5 mm), and lug-to-lug no longer than about 29% of it plus 1 mm. A guide, not a rule; flat or round wrists differ.
Strap fit
Both take 20 mm straps, so straps move between them. Size charts: Tudor lug width chart · Tudor lug width chart.
Which should you buy?
It is the more compact case on paper (37 mm across). Our sizing guide puts it at about 14.7–16.6 cm.
It is the slimmer case at 11.2 mm.
Prices and where to buy
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More: All Tudor Black Bay 58 references · All Tudor Black Bay 54 references.
Questions
Which is bigger, the Tudor Black Bay 58 7939A1A0NU-0001 or the Tudor Black Bay 54 79000B-0001?
Per the brands, the Tudor Black Bay 58 7939A1A0NU-0001 is 39 mm across and the Tudor Black Bay 54 79000B-0001 is 37 mm.
Which is more water-resistant?
Tudor Black Bay 58 7939A1A0NU-0001: 200 m. Tudor Black Bay 54 79000B-0001: 200 m.
Have you tested these watches?
No. This comparison uses brand-published specs and our own analysis of them, not hands-on testing.
Watch.co is independent and not affiliated with any brand. We haven't handled these watches for this page: everything here comes from brand-published specs and our own analysis. Brand names are used only to identify products.