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Tudor · Black Bay

Tudor Black Bay Ceramic

Reference M7941A1ACNU-0001 · Dive · 41 mm

1020304050Ø 41 mmLug-to-lug 49 mm
Illustration drawn from the specifications: case to scale, colours and style approximate. Not a photo. Photos on the official page

Specifications

Reference
M7941A1ACNU-0001
Family
Black Bay
Category
Dive
Status
Current
Case material
Ceramic
Case diameter
41 mm
Case thickness
13.6 mm Official
Lug-to-lug
49 mm Third-party
Lug width
21 mm Official
Water resistance
200 m
Bezel
Rotating, diver
Certifications
COSC, METAS
Calibre
MT5602-U Official
Power reserve
70 h

Official product page · retrieved October 14, 2026

Does it fit your wrist?

Enter your wrist circumference. The watch appears to scale on the flat top of the wrist.

1020304050Lug-to-lug 49 mmFlat top of the wrist 54.1 mm
Top view on a wrist, to scale
Flat top of the wrist 54.1 mmLug-to-lug 49 mmCase diameter 41 mm
Side view, across the wrist

Comfortable

Lug-to-lug 49 mm on a flat top of 54.1 mm: 91 % of the width.

Lug-to-lug is 75 to 95% of the flat top, the usual comfortable range.

Measurements and sources

Brands rarely publish thickness, lug width and lug-to-lug together. Each observation below is kept separate, with who gave it.

Case thickness

Value Type Source Date
13.6 mm Official Tudor October 14, 2026

Lug-to-lug

Value Type Source Date
49 mm Third-party Everest Bands Strap retailer size guide (December 2023), model-level figure listed for refs 7941A1A0RU, 79230, 79210, 79733. This reference is not listed; the 49 mm figure is the one given for ref. 7941A1A0RU, the steel version of this slimmer case. October 14, 2026

Lug width

Lug width is the gap between the lugs, where the strap fits. It is not lug-to-lug.

Value Type Source Date
21 mm Official Tudor October 14, 2026

Calibre source

Official Tudor · retrieved October 14, 2026

Other Black Bay references

Watch Ø Thickness Lug-to-lug Calibre
Black Bay M7941A1A0NU-0003 41 mm 12.7–13.6 mm⚠ 49–50 mm⚠ MT5602-U
Black Bay 31 M79600-0001 31 mm 9.5 mm 37.8 mm MT5201
Black Bay 36 M79640-0002 36 mm 10.5 mm 43.9 mm MT5400
Black Bay 39 M79660-0002 39 mm 12 mm 47.3 mm MT5602
Black Bay 41 M79680-0002 41 mm 12.2 mm 50.2 mm MT5601

Same brand in the data set

Watch Ø Thickness Lug-to-lug Calibre
1926 28 M91350-0011 28 mm 9.1 mm — T201
1926 36 M91450-0001 36 mm 9.2 mm — T601
1926 39 M91550-0001 39 mm 9.2 mm — T601
1926 Luna M91560-0002 39 mm 10.1 mm — T607-9
1926 M91650-0001 41 mm 9.3 mm — T601
Black Bay 54 M79000B-0001 37 mm 11.2 mm 45.8 mm MT5400
Black Bay 58 M7939A1A0NU-0002 39 mm 11.7 mm 47.8 mm MT5400-U
Black Bay 58 GMT M7939G1A0NRU-0001 39 mm 12.8 mm — MT5450-U
Black Bay 58 925 M79010SG-0002 39 mm 12.7 mm 47.8 mm MT5400
Black Bay 58 Bronze M79012M-0001 39 mm 11.9 mm 47.8 mm MT5400
Black Bay 68 M7943A1A0NU-0001 43 mm 13.6 mm — MT5601-U
Black Bay Bronze M79250BA-0001 43 mm 14.6 mm 52.7 mm MT5601
Black Bay Chrono M79360N-0014 41 mm 14.4 mm 50 mm MT5813
Black Bay GMT M79830RB-0001 41 mm 14.6 mm 50 mm MT5652
Black Bay Pro M79470-0004 39 mm 14.6 mm 47.2 mm MT5652
Monarch M2639W1A0U-0001 39 mm 11.9 mm — MT5662-2U
Northflag M9140G1A0U-0001 40 mm 12.7 mm — MT5652-U
Pelagos Ultra M2543C1A7NU-0001 43 mm 14.5 mm — MT5612-U
Pelagos 39 M25407N-0001 39 mm 11.8–12.2 mm⚠ 47 mm MT5400
Pelagos 42 M25600TB-0001 42 mm 14.3 mm 50 mm MT5612
Pelagos FXD GMT M2542GXX7NU-0002 42 mm 12.7 mm — MT5652-U
Pelagos FXD M25717N-0001 42 mm 12.8 mm 52 mm MT5602
Pelagos FXD Chrono M25827KN-0001 43 mm 13.2 mm 52 mm MT5813
Ranger 36 M79930-0007 36 mm 11 mm — MT5400
Ranger M79950-0001 39 mm 12 mm 47 mm MT5402
Royal 36 M2836C1A0-0102 36 mm 9.7 mm — MT5412
Royal M2840D1A0-0001 40 mm 11.4 mm — MT5633

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