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Tudor Black Bay GMT 41mm Stainless Steel
Ref. M79830RB-0001
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Stepping up in the same colour and case shape
The Black Bay GMT arrived at Baselworld 2018 as Tudor's answer to a question collectors had been asking for years: what would a proper GMT look like, built in-house, with a movement designed for the complication rather than adapted to it. The MT5652 is COSC-certified and carries a native flyer GMT — the 24-hour hand reads a second time zone directly from the movement's own architecture, with a 70-hour power reserve that puts it well clear of the working week. The burgundy and blue aluminium bezel insert, the configuration collectors have long called "Pepsi", is bidirectional and pairs with the matte black domed dial and angular Snowflake hands to make a case that reads unmistakably as Black Bay while doing something its siblings cannot. At 41mm across and 50mm lug to lug, this wears with some authority. The 14.6mm case height is the honest trade-off for everything packed inside, and it sits proud of the wrist in a way that suits casual and outdoor wear rather than a narrow dress cuff. The vintage-inspired bracelet — stepped satin-brushed links with polished outer edges, secured by a fold-over clasp with a flip-lock catch — is adjusted via screw-in links and a three-position tool-operated microadjust at the clasp. It is a considered system, though it lacks the tool-free T-fit adjustment Tudor introduced on later references, so dialling in the fit takes a few minutes and a push-pin rather than a thumbnail.
- Reference
- M79830RB-0001
- Brand
- Tudor
- Collection
- Black Bay
- Case size
- 41mm
- Case thickness
- 14.6mm
- Lug width
- 22mm
- Case material
- Stainless steel
- Case shape
- Round
- Dial
- Black
- Crystal
- Sapphire
- Bezel
- Bidirectional rotating
- Movement
- Automatic
- Calibre
- MT5652
- Functions
- GMT, Date
- Water resistance
- 200m
- Bracelet / strap
- Stainless steel bracelet
- Strap colour
- Silver
- Clasp
- Folding clasp
- Lume
- Luminous
- Condition
- Pre-owned
- Retailer
- Mappin & Webb
Additional specifications
- Lug-to-lug
- 50mm
- Power reserve
- 70 hours
Learn more about Tudor
Tudor exists because Hans Wilsdorf wanted to sell a Rolex to people who could not afford one. He registered the name in 1926 and relaunched it properly in 1946 as a separate company: Rolex cases, Rolex bracelets, Rolex crowns, but bought-in movements — usually ETA — at a fraction of the price.
For decades this made Tudor the practical choice for organisations buying in bulk. The French Marine Nationale issued Submariners to its divers. The US Navy tested them. Tudor's military history is arguably richer than Rolex's, because navies bought Tudors.
The watches developed their own identity regardless. The snowflake hands fitted to Submariners from 1969, specified by the French navy for legibility, became a signature the brand still uses. The Monte Carlo chronographs of the early 1970s, with their orange and blue dials, look nothing like anything Rolex made.
The brand withdrew from the US market in 1996 and spent a decade in relative obscurity before returning in 2013 with the Heritage Black Bay, which mined the archive rather than chasing modernity. It worked. Tudor now develops its own movements through a partnership with Kenissi, supplies calibres to Breitling, and holds METAS Master Chronometer certification — a technical position it never had when it was simply the affordable Rolex.
- 1926
- Hans Wilsdorf registers the Tudor name.
- 1946
- Montres Tudor SA is established as a separate company.
- 1969
- Snowflake hands appear on Submariners for the French navy.
- 2012
- The Black Bay revives the brand internationally.
- 2015
- The first in-house Tudor calibre is released.
Also in 6 collections
This watch appears in Stainless Steel Watches (2,616), Automatic Watches (1,362), Sports Watches (675), Dive Watches (469), Pre-Owned, Ex-Display & Vintage Watches (235) and GMT Watches (178).
What the specifications mean
A mechanical watch built to be worn hard and got wet.
Strengths
- 200m water resistance, rated for actual diving
- Sapphire crystal, which resists scratching
- 70-hour reserve survives a weekend off the wrist
- Luminous hands and markers for low light
- Second time zone for travelling
Worth knowing
- 14.6mm thick, so it will not disappear under a cuff
Compare alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | M79830RB-0001 | WBP2150.FT6210 | BR03A-GB-ST/SCA |
|---|---|---|---|
| Price | £3,050 | £3,360 | £2,650 |
| Case size | 41mm | 40mm | 41mm |
| Water resistance | 200m | 200m | 100m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Stainless steel bracelet | Rubber strap | Leather strap |
| Power reserve | 70 hours | 38 hours | 54 hours |
| This watch | Closely matched |
|
Your new watch
Frequently asked questions, and things you should know about this watch
Can I swim with it?
Yes. At 200m it is rated for swimming, snorkelling and recreational diving.
Will the glass scratch?
Unlikely. Sapphire is second only to diamond in hardness and shrugs off everyday marking.
Does it need a battery?
No. It is automatic — the motion of your wrist winds it, and there is no cell to replace.
How long does it run for when it's not worn?
About 70 hours fully wound — enough to sit off the wrist over a weekend and still be running.
What size strap does it take?
22mm. Any strap of that width will fit, and on most modern watches quick-release bars make the swap a two-minute job with no tools.
Will it fit my wrist?
Lug-to-lug is 50mm, which suits wrists from roughly 16.5cm (6½ inches) upward.
Lug-to-lug decides fit more than case diameter does.
Is it a men's or women's watch?
Listed as men's.
Cheapest place to buy
Mappin & Webb at £3,050, pre-owned. No UK retailer we track lists this reference new.
Is this available new?
Not from the UK retailers we track. This reference is listed as pre-owned only, at £3,050 from Mappin & Webb. A pre-owned watch has been worn, and is normally sold under the retailer’s own warranty rather than the manufacturer’s.
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