Tudor
Tudor Black Bay 58 Master Chronometer 7939A1A0NU
The Tudor Black Bay 58 Master Chronometer (reference 7939A1A0NU) is a 39 mm stainless Steel watch with a black dial. It runs on the automatic caliber MT5400-U with a 65-hour power reserve and is water resistant to 200 m.
Specifications
Case
- Reference
- 7939A1A0NU
- Collection
- Black Bay
- Case size
- 39 mm
- Thickness
- 11.7 mm
- Case material
- Stainless Steel
- Case shape
- Round
- Crystal
- Sapphire
- Water resistance
- 200 m
- Bracelet / strap
- Stainless Steel
Dial and bezel
- Dial
- Black
- Bezel
- Rotating 60-min, anodised aluminium insert
Movement
- Movement
- Automatic
- Caliber
- MT5400-U
- Power reserve
- 65 hours
Production
- Production
- Current
Dial versions
This reference was made with these dials and finishes.
7939A1A0NU Black Domed, applied hour markers #0001
M7939A1A0NU-0001
Domed, applied hour markers
7939A1A0NU Black Domed, applied hour markers #0002
M7939A1A0NU-0002
Domed, applied hour markers
7939A1A0NU Black Domed, applied hour markers #0003
M7939A1A0NU-0003
Domed, applied hour markers
How it compares within the Black Bay family
Side by side with other references in the same collection, from the catalog.
| Reference | Size | Material | Dial | Caliber | Years |
|---|---|---|---|---|---|
| 7939A1A0NU (This watch) | 39 mm | Stainless Steel | Black | MT5400-U | — |
| 79310N | 39 mm | Steel | Yellow | MT5813 | 2025– |
| 7939G1A0NRU | 39 mm | Stainless Steel | Black | MT5450-U | 2024– |
| 7941A1A0NU | 41 mm | Stainless Steel | Black | MT5602-U | 2023– |
| 79600 | 31 mm | Stainless Steel | — | MT5201 | 2023– |
| 79640 | 36 mm | Stainless Steel | — | MT5400 | 2023– |
| 79660 | 39 mm | Stainless Steel | — | MT5602 | 2023– |
| 79680 | 41 mm | Stainless Steel | — | MT5601 | 2023– |
| 79833MN | 41 mm | Steel | Black | MT5652 | 2022– |
About the Black Bay family
The Black Bay was introduced in 2012 as the Heritage Black Bay, a dive watch drawing on Tudor's 1950s Submariners with a domed crystal, a large crown without guards and snowflake hands. It quickly grew into Tudor's main family.
The first models used an ETA caliber; from 2016 the Black Bay moved to the in-house MT5602 and related calibers. The family includes the 39 mm Black Bay Fifty-Eight of 2018, the GMT, the Chrono, Bronze versions, the Pro, the smaller Black Bay 54 and Master Chronometer models from 2023. Dealers note the size, bezel colour, caliber generation and bracelet or strap, since many versions share the same look.
Quick answers
- What size is the Tudor Black Bay 58 Master Chronometer 7939A1A0NU?
- The Tudor Black Bay 58 Master Chronometer 7939A1A0NU has a 39 mm case, 11.7 mm thick.
- What movement does the Tudor Black Bay 58 Master Chronometer 7939A1A0NU use?
- It uses the automatic caliber MT5400-U, with a 65-hour power reserve.
- How water resistant is the Tudor Black Bay 58 Master Chronometer 7939A1A0NU?
- It is water resistant to 200 metres.
- Is the Tudor Black Bay 58 Master Chronometer 7939A1A0NU still in production?
- Yes, it is a current reference.
- What is the Tudor Black Bay 58 Master Chronometer 7939A1A0NU made of?
- The case is stainless Steel. Bracelet or strap: Stainless Steel.
Catalog facts checked October 2026.