TUDOR · Black Bay and Black Bay Ceramic
TUDOR M7941A1A0NU-0001 vs TUDOR M7941A1ACNU-0001
7 published specifications differ between these two, and 8 are identical. Every figure below is what the manufacturer states for that reference; nothing is inferred from the other watch.
What differs
| Specification | TUDOR Black Bay 41, steel on braceletM7941A1A0NU-0001 | TUDOR Black Bay Ceramic, 41mm full ceramicM7941A1ACNU-0001 |
|---|---|---|
| Case | 41mm steel case with polished and satin finish | 41mm matt black ceramic case with micro-blasted finish |
| Bezel | 60-minute unidirectional bezel in stainless steel with black aluminium insert | Unidirectional rotatable bezel in black-PVD-treated steel with 60-minute graduated disc in black ceramic, sunray satin finish, engraved markings and numerals |
| Dial | Black, domed, with silver-coloured applied hour markers | Charcoal, sunray finish, domed |
| Crown | Stainless steel screw-down crown with the TUDOR rose in relief | Screw-down winding crown in black-PVD-treated steel with the TUDOR rose in relief and circular satin-brushed steel winding crown tube |
| Bracelet | 3-link stainless steel bracelet with polished and satin finish | Full ceramic bracelet in matching black |
| Clasp | TUDOR "T-fit" clasp | Proprietary dual folding clasp design |
| Certification | COSC and METAS certified (Master Chronometer) | COSC and METAS certified |
What is identical
Worth knowing as much as the differences: these are the specifications you cannot use to tell the two apart.
- Diameter
- 41 mm
- Thickness
- 13.6 mm
- Lug width
- 21 mm
- Water resistance
- Waterproof to 200m (660 ft)
- Crystal
- Domed sapphire crystal
- Calibre
- Manufacture Calibre MT5602-U
- Movement
- Self-winding mechanical movement with bidirectional rotor system
- Power reserve
- 70-hour power reserve
Stated for one, not the other
These rows cannot be compared, because one maker publishes the figure and the other does not. An empty cell is a gap in the manufacturer's documentation, not a gap in the watch — and not a licence to fill it in from the other column.
| Movement notes | METAS certification covers precision certified by COSC, waterproofness to 200m under the ISO standard, smooth functioning in a 15,000 gauss magnetic field, and the 70-hour power reserve. | not stated |
|---|
What the differences cost you
Each note below follows from the published figures in the tables above — what they mean for intake, for a listing, and for the handover. Nothing here estimates a price or a margin.
Different case materials, different handling
The M7941A1A0NU-0001 is steel and the M7941A1ACNU-0001 is ceramic. Different case materials mark, polish and refinish differently, so the condition language that fits one will mislead on the other. Photograph and describe each on its own terms.
What to check on each
M7941A1A0NU-0001
- Check the T-fit clasp actually adjusts. It is the headline convenience of this generation, and a clasp that has been forced or badly serviced is an expensive part to put right.
- Read the bezel action. TUDOR states it is deliberately harder to turn at the 12 o'clock position to prevent inadvertent rotation — a bezel that spins freely there has been apart.
- Confirm the calibre against the reference. MT5602-U is the Master Chronometer version; earlier Black Bay generations use different movements, and the caseback and papers should agree with what is inside.
M7941A1ACNU-0001
- Inspect every ceramic edge and corner for chips rather than looking for scratches. Ceramic does not abrade, it fractures, and a chipped link or lug is not repairable — the part is replaced or it is not.
- Check the bracelet links individually. A full ceramic bracelet means many separate ceramic components, each of which can be chipped at the pin holes where stress concentrates.
- Compare the PVD-treated steel bezel and crown against the ceramic around them. PVD wears through at high points over time, and a worn edge next to unmarked ceramic is conspicuous.
Sources
- TUDOR official product page for reference M7941A1A0NU-0001 (Black Bay; 41mm steel case; steel bracelet) - watch specifications as published by Montres TUDOR SA - Case: 41mm steel case with polished and satin finish; Lugs: 21mm lug width; Case thickness: 13.6mm; Waterproofness: waterproof to 200m (660 ft); Bezel: 60-minute unidirectional bezel in stainless steel with black aluminium insert; Dial: black; domed; with silver-coloured applied hour markers; Crystal: domed sapphire crystal; Movement: Manufacture Calibre MT5602-U (COSC and METAS certified); self-winding mechanical movement with bidirectional rotor system; Power Reserve: 70-hour power reserve; Winding Crown: stainless steel screw-down crown with the TUDOR rose in relief; Bracelet: 3-link stainless steel bracelet with polished and satin finish with TUDOR T-fit clasp; the page also states a five-year guarantee and describes METAS Master Chronometer certification as covering precision certified by COSC; waterproofness to 200 m in accordance with ISO standard; smooth functioning when exposed to a magnetic field of 15000 gauss; and a 70-hour power reserve; the unidirectional rotatable bezel rotates in one direction only and is deliberately harder to turn when the zero marker is at 12 o'clock to avoid inadvertent rotation — retrieved 2026-09-22
- TUDOR official product page for reference M7941A1ACNU-0001 (Black Bay Ceramic; 41mm ceramic case; full ceramic bracelet) - Case: 41mm matt black ceramic case with micro-blasted finish; Lugs: 21mm lug width; Case thickness: 13.6mm; Waterproofness: waterproof to 200m (660 ft); Bezel: unidirectional rotatable bezel in black-PVD-treated steel with 60-minute graduated disc in black ceramic with sunray satin finish and engraved markings and numerals; Dial: charcoal; sunray finish; domed; Crystal: domed sapphire crystal; Movement: Manufacture Calibre MT5602-U (COSC and METAS certified); self-winding mechanical movement with bidirectional rotor system; Power Reserve: 70-hour power reserve; Winding Crown: screw-down winding crown in black-PVD-treated steel with the TUDOR rose in relief and circular satin-brushed steel winding crown tube; Bracelet: full ceramic bracelet in matching black with proprietary dual folding clasp design — retrieved 2026-09-22
Not affiliated with TUDOR. Specifications are read from each manufacturer's own published documentation on the dates shown and may change; the manufacturer's current documentation governs.