Tudor Black Bay Ceramic M7941A1ACNU-0001

Imagen: Tudor, web oficial

The storyWhy this reference matters

The story starts in 2019 with a one-off made for the Only Watch auction: a black ceramic Black Bay called the Black Bay Ceramic One. Two years later Tudor turned it into a catalogue watch as the reference 79210CNU, and that's where the surprise sits. That matte black watch, the odd one out of the family, was the first Tudor certified Master Chronometer by METAS. The brand's accuracy credentials didn't debut on the steel classics. They debuted here.

The 2026 version adds the piece that was missing: a full ceramic bracelet, three brushed links. That forced a rethink of the clasp. Ceramic won't bend, rivet or take tension the way steel does, so Tudor's usual T-fit was no use and a double folding clasp had to be designed in ceramic specifically for this watch. It's the kind of problem that stays invisible from the outside and explains why almost nobody builds ceramic bracelets.

The case has caught up with the rest of the family while it was at it: 13.55 millimetres, almost one less than the 2021 version, with the crown re-fluted and the bezel notches redrawn. The case back went from sapphire to solid steel with black PVD, and the dial from black to a charcoal grey with a radial brushed finish, a shade lighter than the bezel insert. Inside, still the MT5602-U — 25 jewels, 70 hours and both COSC and METAS certification.

SpecificationsThe numbers, in one table

IdentificationHow to tell it apart

The middle case is a single block of matte black ceramic, micro-blasted, with the lug bevels polished: under light the watch is entirely dead apart from those two bright lines. It's the best visual trick it has and the one that shows most in person.

Careful with a detail that gets reported wrong more often than not: the rotating bezel is not solid ceramic. It's steel with black PVD carrying a ceramic insert on top. The crown and case back are PVD steel too. And that case back is solid, not sapphire: if the watch you're shown lets you see the movement, it's the 79210CNU of 2021 and not this one.

The snowflake hands are blackened and the Super-LumiNova comes in a darkened tone rather than cream. The seconds hand ends in a ball. The dial once again carries the depth rating in print, and the bracelet is ceramic across all three links, with a double folding clasp that is ceramic as well.

CollectingWhat collectors check

Ceramic doesn't scratch, but it chips. That's the rule, and it's worth taking on board before you buy: a knock to an edge can't be polished out, can't be recovered and can't be disguised. Go over the lug bevels, the bezel edges and above all the corners of the bracelet links under raking light, since those are the parts that meet door frames and desks.

The clasp is proprietary and shares no parts with the brand's steel folding clasps. Open and close it several times, feeling for lateral play. If it ever needs replacing there is no generic substitute that will do, and that counts for something in a watch bought to keep for years.

One more thing about the certification: METAS tests the assembled watch, not the loose movement. An example opened by a watchmaker outside Tudor may run perfectly well, but the seal no longer means what it said, so ask about the service history. And don't confuse this with the 79210CNU of 2021, which is the one carrying the historical weight of having been the brand's first METAS watch.

Common questionsWhat people ask us about this reference

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