TUDOR · Black Bay 58 GMT and Black Bay Pro
TUDOR M7939G1A0NRU-0003 vs TUDOR M79470-0001
10 published specifications differ between these two, and 3 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 58 GMT, black and burgundyM7939G1A0NRU-0003 | |
|---|---|---|
| Case | 39mm stainless steel case with polished and satin finishes | 39mm steel case with polished and satin finish |
| Bezel | 24-hour bidirectional rotatable bezel in stainless steel with black and burgundy anodised aluminium insert | 24-hour graduated fixed bezel in satin-brushed steel |
| Dial | Black, domed, with gilt applied hour markers | Black, domed |
| Crown | Stainless steel screw-down winding crown with the TUDOR rose in relief | Screw-down winding crown in steel with the TUDOR rose in relief |
| Bracelet | 5-link stainless steel bracelet with polished and satin finishes | Riveted steel bracelet with polished and satin finish |
| Clasp | TUDOR "T-fit" clasp | TUDOR T-fit clasp with rapid adjustment |
| Calibre | Manufacture Calibre MT5450-U | Manufacture Calibre MT5652 |
| Movement | Self-winding mechanical movement with bidirectional rotor system, integrated GMT function | Self-winding mechanical movement with bidirectional rotor system, built-in architecture |
| Power reserve | 65-hour power reserve | Approximately 70 hours |
| Certification | COSC and METAS certified | COSC |
What is identical
Worth knowing as much as the differences: these are the specifications you cannot use to tell the two apart.
- Diameter
- 39 mm
- Water resistance
- Waterproof to 200m (660 ft)
- Crystal
- Domed sapphire crystal
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.
| Thickness | 12.8 mm | not stated |
|---|---|---|
| Lug width | 20 mm | not stated |
| Movement notes | not stated | TUDOR states a five-year transferable guarantee with no registration or periodic maintenance checks required. |
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 movements to verify and to service
The M7939G1A0NRU-0003 runs the Manufacture Calibre MT5450-U and the M79470-0001 the Manufacture Calibre MT5652. Two consequences at intake: the service history that is normal for one calibre is not evidence about the other, and the calibre is the check that catches a movement swapped into the wrong case. Confirm the movement matches the reference rather than assuming it from the dial.
What to check on each
M7939G1A0NRU-0003
- Turn the bezel both ways. This reference uses a bidirectional 24-hour bezel, and a bezel that refuses to turn anticlockwise belongs to a dive reference, not this one.
- Check the colour split on the insert lines up exactly with the 24-hour graduation. A misaligned two-tone insert is immediately obvious and indicates the part has been off.
- Run the GMT hand through a full rotation and confirm it reads correctly against the bezel at both the day and night ends of the scale.
M79470-0001
- Do not try to turn the bezel. TUDOR specifies it as fixed, so an immovable bezel is correct and forcing it is how a good example gets damaged.
- Confirm the 24-hour bezel is satin-brushed steel with no rotating insert, which distinguishes this reference from the GMT models in the same family.
- Run the T-fit rapid adjustment through its positions and confirm each one locks under a firm pull.
Sources
- TUDOR official product page for reference M7939G1A0NRU-0003 (Black Bay 58 GMT; 39mm steel case; black and burgundy bezel) - Case: 39mm stainless steel case with polished and satin finishes; Lugs: 20mm lug width; Case thickness: 12.8mm; Waterproofness: waterproof to 200m (660 ft); Bezel: 24-hour bidirectional rotatable bezel in stainless steel with black and burgundy anodised aluminium insert; Dial: black; domed; with gilt applied hour markers; Crystal: domed sapphire crystal; Movement: Manufacture Calibre MT5450-U (COSC and METAS certified); self-winding mechanical movement with bidirectional rotor system; integrated GMT function; Power Reserve: 65-hour power reserve; Winding Crown: stainless steel screw-down winding crown with the TUDOR rose in relief; Bracelet: 5-link stainless steel bracelet with polished and satin finishes with TUDOR T-fit clasp — retrieved 2026-09-22
- TUDOR official product page for reference M79470-0001 (Black Bay Pro; 39mm steel; fixed 24-hour bezel) - Case: 39mm steel case with polished and satin finish; Waterproofness: Waterproof to 200m (660 ft); Bezel: 24-hour graduated fixed bezel in satin-brushed steel; Dial: Black, domed; Crystal: Domed sapphire crystal; Movement: Manufacture Calibre MT5652 (COSC); self-winding mechanical movement with bidirectional rotor system; built-in architecture; Power Reserve: Power reserve of approximately 70 hours; Winding Crown: Screw-down winding crown in steel with the TUDOR rose in relief; Bracelet: Riveted steel bracelet with polished and satin finish, and TUDOR T-fit clasp with rapid adjustment; Guarantee: Five-year transferable guarantee with no registration or periodic maintenance checks required — retrieved 2026-09-23
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.