Tudor Black Bay 58 GMT M79873N
Tudor · Self-winding
Overview
The Tudor Black Bay 58 GMT is the 39mm, dual-time member of Tudor's Black Bay 58 line, introduced at Watches & Wonders in April 2024. It pairs a black-and-burgundy 24-hour 'Coke' bezel and a gilt-accented matte black dial with the Manufacture Calibre MT5450-U, a Kenissi-built automatic that is COSC-certified and certified as a METAS Master Chronometer. Reference note: 'M79873N' does not match any catalogued Tudor reference. Every authoritative source (Tudor, WatchBase, monochrome-watches, Watches of Switzerland) lists this watch as M7939G1A0NRU (-0001 three-link rivet bracelet, -0002 rubber strap), with a five-link bracelet option (-0003) added in 2026.
Specifications
M79873N| Case | |
| Case diameter | 39 mm |
|---|---|
| Thickness | 12.8 mm |
| Lug-to-lug | 47.8 mm |
| Movement | |
| Movement | Self-winding (automatic); true 'traveller' GMT with local hour hand adjustable in one-hour increments |
| Caliber | Manufacture Calibre MT5450-U (produced by Kenissi) |
| Water resistance | |
| Water resistance | 200 m |
| Details | |
| Lume | Cream-toned Super-LumiNova |
| Bezel | Bidirectional 24-hour, stainless steel with black and burgundy anodised aluminium insert and gilt markings |
| Crown | Screw-down, with the Tudor rose |
| Hands | Gilt-framed Snowflake hour and GMT hands |
| Jewels | 34 |
| Crystal | Domed 'box' sapphire with anti-reflective coating |
| Frequency | 28,800 vph (4 Hz) |
| Price chf | CHF 4,300 (bracelet) / CHF 4,100 (rubber), 2024 launch |
| Price eur | EUR 4,710 (bracelet) / EUR 4,490 (rubber), 2024 launch |
| Reference | M7939G1A0NRU-0001 (three-link rivet bracelet); M7939G1A0NRU-0002 (rubber strap) |
| Dial color | Domed matte black with gilt-framed applied markers |
| Lug width mm | 20 |
| Case material | Stainless steel, polished and satin finishing |
| Certification | COSC-certified and METAS Master Chronometer certified |
| Balance spring | Silicon (non-magnetic) |
| Bracelet taper | Bracelet tapers to 18mm at the clasp |
| Metas accuracy | -0/+5 seconds per day; magnetic resistance to 15,000 gauss |
| Bracelet options | Three-link 'rivet-style' stainless steel bracelet or rubber strap; T-fit folding clasp |
| Power reserve hours | 65 |
| Clasp microadjustment | 'Tudor T-fit' clasp with an 8mm micro-adjustment window |
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Retailer search links · availability variesFrequently asked questions
Is the Tudor Black Bay 58 GMT M79873N automatic?
Yes, the Tudor Black Bay 58 GMT M79873N is powered by an automatic (self-winding) movement, caliber Manufacture Calibre MT5450-U (produced by Kenissi).
Is the Tudor Black Bay 58 GMT M79873N waterproof?
It is rated to 200 m (20 ATM) of water resistance. "Waterproof" is not an official watch rating; this depth rating describes its resistance to water pressure under the noted conditions.
What size is the Tudor Black Bay 58 GMT M79873N?
The Tudor Black Bay 58 GMT M79873N has a case diameter of 39 mm, a thickness of 12.8 mm, and a lug-to-lug distance of 47.8 mm.
Sources
Verified · 4 referencesEvery spec on this page was independently checked against the sources below before publishing.