Name: Tudor Black Bay Chrono M79360N
Brand: Tudor
SKU: M79360N

The Black Bay Chrono arrived in 2017 as Tudor's first in-house chronograph, built around the MT5813 and wearing that movement's column-wheel, vertical clutch architecture in a 41mm steel case. The bicompax dial keeps things clean: running seconds at nine, thirty-minute counter at three, nothing extraneous. For what you pay, it is one of the most technically complete sport chronographs on the market.

What it is

Tudor had long sourced movements from ETA and Valjoux, so the MT5813 represented a significant departure when it debuted at Baselworld 2017. The caliber was co-developed with Breitling on the B01 architecture, a column-wheel, vertical clutch platform that Breitling had spent years refining in their own Manufacture. Tudor adapted the movement, added a 70-hour power reserve, and certified it as COSC-compliant.

The Black Bay Chrono was immediately positioned as a daily-wear sport chronograph with genuine horological credibility, not a retro styling exercise backed by a commodity movement. It has carried that positioning without a major architecture change since launch.

Buying notes

The 41mm case with its prominent crown-protecting Tudor crown guards sits noticeably thick on the wrist, and buyers who expect it to wear like a slim dresser will be disappointed. Early references produced 2017 through roughly mid-2019 had reported inconsistency in the pushers' feel at lower temperatures; if you're buying pre-owned, confirm pushers operate crisply before purchase. The Rolex-adjacent pricing in the used market means M79360N examples in poor condition rarely get heavily discounted, so condition matters more here than with other pre-owned sport watches.

The aluminum bezel insert on the M79360N scratches easily and is not replaceable as a standalone part at most independent watchmakers. Straps and bracelets are proprietary Tudor fitment, which limits your aftermarket strap options compared to standard 20mm lug watches.

Market read

New M79360N examples retail around $4,500 to $4,800 depending on region, with the steel bracelet version commanding a slight premium over the fabric strap configuration. Pre-owned examples trade in the $3,200 to $4,000 range depending on condition and box-and-papers status. The Breitling B01 platform link has not hurt resale; buyers understand the MT5813 is a serious movement and price accordingly.

Service expectations

The MT5813 is a column-wheel vertical clutch chronograph and should be serviced every seven to ten years under normal use. Tudor service through an authorized center includes a full movement overhaul with documented work on the chronograph mechanism; budget around $600 to $900 for a full service. Independent watchmakers with B01 experience can work on the MT5813, which broadens your service options compared to movements with no platform relatives.

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GPHG 2021EnteredChronographe category

Entry to the Grand Prix d'Horlogerie de Genève is voluntary and made by the brand. An entry is a watch registered for that year's competition, not a jury verdict, and several large houses including Rolex, Patek Philippe and Omega do not take part at all.

Mass-produced#4 in familyOfficial press photos

What it was up against

Chronographe, GPHG 2021

The Chronographe category at GPHG 2021 held 12 entries. These are the other 11.

Filter the full GPHG field for Chronographe, 2021

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Movement tier: unclassified · caliber Tudor MT5813: Breitling B01 base, Tudor-modified, 28,800bph, 70h PR, 25j; column-wheel, vertical clutch; used in Black Bay Chrono · 70h power reserve (2.9 days)

Medium-large: suits wrists 6.5 in+ (16.5 cm+)

41 mm case. Wears confidently on average to larger wrists. May overhang on slender builds.

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Authentication

The MT5813 is a Breitling B01-based movement; any Black Bay Chrono with a generic ETA 7750 has had the movement swapped.

Known issues in the market

Movement swaps to ETA 7750 occur on heavily damaged examples; the B01 architecture is distinctly visible through the caseback.
The vertical clutch produces a distinct engagement feel on the start pusher; a mushy or cam-actuated feel indicates a wrong movement.
Column-wheel operation must be smooth; test start, stop, and reset feel before purchase.

Area	What to check	What is correct	Red flag
caseback	MT5813 movement architecture	B01-derived architecture visible through caseback; movement signed Tudor MT5813 with Breitling-style main plate layout	ETA 7750 architecture visible instead, with the distinctive 7750 column-wheel position and rotor shape
crown	Vertical clutch engagement feel on start pusher	Start pusher engages with a clean, light click; seconds hand begins from zero with no jump or slip	Mushy pusher feel or seconds hand that slips or jumps at start indicating a cam-actuated (non-vertical clutch) mechanism
dial	Black Bay Chrono sub-register layout	Running seconds at 9, 30-minute counter at 3; layout matches the MT5813-specific dial specification	Sub-register positions inconsistent with the MT5813 layout indicating a movement or dial swap

Common legitimate replacements

MT5813 service must go through Tudor or an authorized Breitling-family center; the B01 architecture requires specialized tooling.
ETA 7750 movements are sometimes used as service replacements on badly damaged examples; the caseback check is definitive.

Expert resources: Tudor Black Bay Chrono documentation at tudorwatch.com. WatchUSeek Tudor subforum for MT5813 versus ETA 7750 visual identification through caseback.

Authentication guide

Last reviewed June 2026

The Black Bay Chrono uses the MT5813, a column-wheel vertical-clutch chronograph caliber developed with Breitling (sharing the same base as the B01). The panda or reverse-panda dial with large sub-registers and the snowflake hands are the defining visual elements. The MT5813 is one of the most respected chronograph calibers in the mid-tier segment. Verify the movement through the exhibition caseback.

Known reproduction risks

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HIGH RISK

Replicas using ETA 7750 or generic column-wheel chronograph movements that approximate the BB Chrono aesthetic but cannot replicate the MT5813 caseback view.

Non-MT5813 movement visible through exhibition caseback -- check for caliber markings and column wheel geometry
Snowflake hand proportions off -- too narrow, too pointed, or with wrong lume plot shape
Panda/reverse-panda dial with sub-register positions inconsistent with the genuine 3/6/9 layout
Power reserve under 48 hours from full wind

Dial variants by era

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Era	Description	Identifiers
2017 to present (panda -- white dial, black sub-registers)	White dial with black sub-registers. The large sub-register circles at 3 (30-minute), 6 (small seconds), and 9 (12-hour) are the defining visual. Snowflake hands throughout.	White dial with black sub-registers at 3, 6, and 9 o'clock Snowflake hands on the main time display and on each sub-register Date window at 6 o'clock integrated into the small-seconds sub-register at some configurations Bidirectional steel bezel with no insert or scale 41mm case with push-in pump pushers at 2 and 4 o'clock
2017 to present (reverse panda -- black dial, silver sub-registers)	Black dial with silver sub-registers. Same case and movement specification.	Black dial with silver sub-registers at the same positions as the panda variant Same snowflake hand profile and MT5813 movement

Service part flags

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MT5813 movement (visible through caseback)

Original: Tudor MT5813 is a column-wheel, vertical-clutch chronograph caliber developed with Breitling. Runs at 28,800bph with 70-hour power reserve, 25 jewels. The exhibition caseback shows the column wheel and the distinctive rotor. The caseback has "MT5813" designation and Tudor hallmarks.

Replacement tells

No column wheel visible through the exhibition caseback -- a cam-switching mechanism indicates a non-MT5813 movement
Power reserve depleting in under 48 hours from full wind
Caseback without "MT5813" designation
Rotor profile inconsistent with the Tudor/Breitling shared caliber design

Exhibition caseback

Original: The Black Bay Chrono has an exhibition (sapphire) caseback as standard. The column wheel and rotor are visible. The caseback perimeter has "TUDOR" and caliber markings.

Replacement tells

Solid caseback on a stated BB Chrono -- the exhibition caseback is standard; a replacement solid back indicates component work has been done
Exhibition caseback with incorrect engraving text or misaligned aperture

Pump pushers

Original: The BB Chrono uses push-in pump pushers at 2 and 4 o'clock. They have a round cross-section and extend slightly beyond the case band. They are not flush-integrated like the Monaco pushers.

Replacement tells

Pushers that do not activate the chronograph function at all
Pushers with the wrong diameter or surface finish for the BB Chrono case

Case back markings

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2017 to present

Exhibition (sapphire) caseback with Tudor shield and MT5813 designation visible through the window
"TUDOR BLACK BAY CHRONO" on the perimeter ring
"200M / 660FT" water resistance rating
Reference M79360N and serial number on the case

Movement tells

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MT5813 (Breitling B01 base, Tudor-modified), 28,800bph, 70-hour power reserve. A well-regarded chronograph caliber with a good service reputation.
Column wheel verification through the exhibition caseback is the primary authentication check. The column wheel rotates one step per pusher activation.
Vertical clutch engagement: the chronograph seconds hand advances without the tick-back of a horizontal clutch at start.
Fully wound BB Chrono should run 65 to 70 hours before stopping.

Sources: Tudor -- Black Bay Chrono specification.