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The Tudor Black Bay 54 “Lagoon Blue” pairs the line’s vintage-proportioned 37 mm case with a bright, sand-textured blue dial, a mirror-polished steel bezel insert and a five-link bracelet. Introduced in June 2025, it keeps the familiar Black Bay 54 essentials: the MT5400 automatic movement, a 70-hour power reserve and 200 m water resistance.
What is the Black Bay 54 “Lagoon Blue”?
It is a blue-dial colorway of Tudor’s Black Bay 54, not a new case or movement platform. Tudor identifies the model as reference 79000; Fratello’s specification table gives the bracelet version’s full reference as M79000-0001. Its defining look comes from the light-blue dial’s granular, sand-like texture, contrasted with the reflective steel bezel insert and its 60-minute scale.
The dial has applied luminous indexes beneath a domed sapphire crystal. The steel bracelet uses five links across its width and closes with Tudor’s T-fit clasp, which allows on-the-fly micro-adjustment. Those exterior details make the Lagoon Blue visually distinct from the darker Black Bay 54 options while retaining the family’s compact proportions.
Size, water resistance and movement
| Specification | Black Bay 54 “Lagoon Blue” |
|---|---|
| Case diameter | 37 mm |
| Lug-to-lug | About 46 mm |
| Thickness | 11.2–11.24 mm, depending on the published specification |
| Water resistance | 200 m (660 ft); screw-down crown |
| Movement | Tudor Manufacture Calibre MT5400, automatic, COSC-certified |
| Frequency and jewels | 28,800 vibrations per hour; 27 jewels |
| Balance spring | Silicon |
| Power reserve | Approximately 70 hours |
At 37 mm across and about 46 mm lug-to-lug, the BB54 is notably compact by contemporary dive-watch standards. The 200 m rating and screw-down crown give it substantial stated water resistance, though the rating is not a substitute for checking the crown is secured and the watch is in suitable condition before water use.
#1 Best Overall
- Featuring a Silver-tone Band, Silver-tone Case, Scratch Resistant Sapphire Crystal
- Style: Modern
- Item shape: Round
- Closure type: Buckle
- Display type: Analog
The COSC-certified MT5400 is the established mechanical core of the model. Its approximately 70-hour reserve means the watch can be set aside over a weekend and still have reserve when picked up, assuming it was sufficiently wound beforehand. The silicon balance spring is part of the movement specification; it should not be read as a guarantee of immunity to every source of magnetic interference.
What changed from other Black Bay 54 versions?
The Lagoon Blue changes the visual character and bracelet configuration rather than the core size, movement, reserve or water rating. The key comparison points are summarized below; exact prices for other versions are not established here.
Rank #2
- Tudor Black Bay 36 Automatic Chronometer Blue Dial Unisex Watch M79640-0002
| Feature | Lagoon Blue | Black or Tudor Blue BB54 variants |
|---|---|---|
| Dial | Light blue with sand-like texture | Black or Tudor Blue, respectively; specific finish details are not stated here |
| Bezel | Mirror-polished steel insert with contrasting 60-minute scale | Specific bezel finish differences are not stated here |
| Bracelet or strap | Five-link steel bracelet with T-fit clasp | Configuration depends on variant; the available comparison information does not establish each option |
| Case, movement and water resistance | 37 mm case; MT5400; approximately 70-hour reserve; 200 m | Core specifications are largely shared across the family; confirm the exact reference for any individual model |
| Price | Launch prices varied by market; see the pricing section | Comparable current prices are not stated here |
In practical terms, the choice is chiefly about appearance and configuration: the Lagoon Blue is the bright, textured option with a five-link bracelet. For a direct purchase comparison, check the full reference, included bracelet or strap, and current regional price rather than assuming those details are identical across every BB54 listing.
How much did it cost at launch?
Published 2025 launch prices differed by market: Tudor and Hodinkee reported US$4,350 for the United States, Fratello reported €4,240 in Europe and £3,590 in the United Kingdom, and Tudor’s Swiss press specification listed CHF 3,900 including VAT. These are launch figures, not a promise of current retail pricing; taxes, market, retailer and later price changes can affect what a buyer is quoted.
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Rank #3
- Tudor Black Bay 39 Automatic Chronometer Blue Dial Unisex Watch M79660-0002
Is the Lagoon Blue limited edition, and where can you buy it?
Hodinkee listed the Lagoon Blue as not limited edition. That describes its edition status, not whether a particular dealer has one in stock. Current regional availability was not established, so check Tudor’s local retailer information or contact an authorized dealer for live stock, delivery timing and the price applicable in your market. When shopping online, match the listing to reference M79000-0001 if you want the five-link bracelet configuration described here.
Quick Recap
Best Value
- Tudor Black Bay 54 Automatic Chronometer Black Dial Men's Watch M79000N-0001
Rank #4
- Main Material: Stainless Steel
- Case Size: 39mm Steel Case with Polished and Satin Finish
- Series: Black Bay 58
- Dial Hue: Burgundy
- Movement Type: Manufacture Calibre MT5400-U; Self-winding Mechanical Movement with Bidirectional Rotor System
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
