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Movement tier: unclassified · caliber Tudor Manufacture Cal. MT5400: in-house automatic, 28,800bph, 70h PR; COSC-certified, bidirectional rotor, silicon balance spring · 70h power reserve (2.9 days)
Versatile size: fits most wrists (6–7.5 in / 15–19 cm)
39 mm case. 20 mm lug width. The sweet spot for the broadest range of wrist sizes. Neither too dainty nor too bold.
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Solid 18ct yellow gold with a green dial, and the only gold Black Bay in this catalog. The gold and the anodised aluminium bezel are an unusual pairing and both are worth checking.
Known issues in the market
The case is solid 18ct gold, not plated or gold-capped steel. Weight and hallmarking settle it quickly.
The bezel disc is matt green ANODISED ALUMINIUM with gilded markings, not ceramic. It scratches the way aluminium does, and a ceramic-looking insert on this reference is wrong.
The caseback is open with a sapphire crystal, unlike most Black Bay references, so the MT5400 should be visible and should be an MT5400.
Area
What to check
What is correct
Red flag
case
Solid gold weight and hallmarks
Heavy for 39mm, hallmarked for 18ct
Light for its size, or wear showing a different metal beneath
case
Anodised aluminium disc
Matt green with gilded markings; marks and scratches as aluminium does
A glossy ceramic-like surface, which this reference does not use
caseback
Open caseback and caliber
Sapphire caseback showing the MT5400 with its bidirectional rotor
A solid caseback, or a movement that is not an MT5400
movement
COSC performance and reserve
Roughly 70 hours from full wind, chronometer-grade rate
A reserve well short of 70 hours
Common legitimate replacements
Straps and bracelets are swapped routinely on a 20mm lug width; confirm the gold bracelet is original where fitted.
Bezel discs are replaced after damage.
Expert resources: Tudor service can confirm the reference against the case number. The steel and silver Black Bay 58 entries in this catalog cover the shared dial and hand tells.
