Tudor Black Bay 54 M79000N

The Tudor Black Bay 54 (ref. M79000N) is a 37 mm stainless-steel divers' watch introduced in 2023, the most compact dive watch in Tudor's current catalogue. It revives the proportions and gilt-accented black dial of Tudor's first divers' watch, the 1954 Oyster Prince Submariner reference 7922, while using the modern manufacture Calibre MT5400 — a COSC-certified automatic with a 70-hour power reserve — and is water resistant to 200 m.

The "54" in the name refers to 1954, the year Tudor introduced its first divers' watch. Monochrome describes the Black Bay 54 as a direct tribute to the 1954 Tudor Oyster Prince Submariner reference 7922, the brand's first Submariner. Teddy Baldassarre frames the watch in the same terms, calling it a 37 mm vintage reimagining of the 1954 Oyster Prince Submariner Ref. 7922.

Where the wider Black Bay family has generally sat around 39–41 mm, the Black Bay 54 returns to the compact case size of that first-generation dive watch. Monochrome notes it is the most compact dive watch in the current Tudor catalogue at 37 mm. The model was introduced in 2023.

Beyond the size, the reference draws on period cues: a gilt-accented black dial and a bezel insert without the fine minute graduations of the larger, more modern Black Bay divers, paired with contemporary construction underneath.

The Black Bay 54 is powered by the manufacture Calibre MT5400, built by Tudor's Kenissi movement operation. Monochrome reports it is chronometer-certified by COSC and held to Tudor's tighter −2/+4 seconds per day, runs at 28,800 vibrations per hour (4 Hz), carries 27 jewels and a non-magnetic silicon hairspring with a variable-inertia balance, and delivers a 70-hour power reserve.

The MT5400 is a smaller-diameter member of Tudor's movement family. Monochrome lists it at roughly 30.3 mm across and about 5 mm thick, sized to suit the 37 mm case rather than the larger MT56xx calibres used in bigger Black Bay models. Winding is via a bidirectional central rotor on a ball bearing.

Teddy Baldassarre describes the caliber as "thoroughly modern," citing the same COSC certification, the −2/+4 tolerance, the 27-jewel count and the 70-hour reserve.

Monochrome's hands-on concluded that the Black Bay 54 "wears like a charm" and that "the size reduction comes without compromises," calling the result "quite brilliant." The same review raised a broader reservation that Tudor "feels more and more like a one-model brand" — a comment about the line rather than about this watch's comfort.

Teddy Baldassarre's review measures the case at 37 mm diameter, 11.24 mm thick and 46 mm lug-to-lug on 20 mm lugs, and describes it as "exceptionally well-proportioned for smaller wrists" with "note-perfect dimensions." The reviewer wrote that it "feels great," likened its comfort to "a single malt in front of a gently crackling fire," and suggested it could serve as a one-watch collection for a vintage-focused enthusiast.

Both strap options carry the T-Fit micro-adjustable clasp, which Monochrome notes provides an 8 mm range of on-the-fly sizing.

At launch in 2023 the Black Bay 54 came in a single colourway: a gilt-accented black dial with a black aluminium bezel insert, offered on a three-link riveted-style steel bracelet (M79000N-0001) or a black rubber strap (M79000N-0002). Both use Tudor's T-Fit clasp with an 8 mm micro-adjustment range, per Monochrome.

In 2025 Tudor added the Black Bay 54 "Lagoon Blue" (reference M79000-0001). Monochrome describes a sand-textured Lagoon Blue dial, a polished steel bezel insert with a 60-minute scale in negative relief, and a five-link Jubilee-style bracelet, priced at CHF 3,900 / EUR 4,240; the technical base (37 mm, 11.24 mm thick, MT5400, 200 m) carries over.

At Watches and Wonders 2026 Tudor introduced an all-blue Black Bay 54, reference 79000B, with a blue dial and blue bezel insert and no gilt accents or date. Monochrome lists it on a riveted steel bracelet or rubber strap at CHF 3,850 (bracelet) and CHF 3,650 (rubber), sharing the 37 mm case and MT5400 movement of the original 79000N.