TUDOR Black Bay Pro M79470-0001: specifications and what to check

A bezel that is supposed to be immovable

TUDOR specifies it plainly: 24-hour graduated fixed bezel in satin-brushed steel.

Fixed. It does not rotate, it was never intended to rotate, and a bezel that will not turn on this reference is not seized — it is correct.

This matters more than it sounds, for two reasons.

At inspection, a dealer who assumes every dive-style TUDOR has a rotating bezel will grip it and twist. On a fixed bezel that applies force to a component designed to be static, and the attempt can damage a watch that was perfect thirty seconds earlier.

At the sale, a buyer who has owned a GMT with a rotating bezel will reach for it, find nothing, and call you. Tell them first.

The fixed bezel also tells you how the second time zone works here. With no rotating ring, the 24-hour hand is read against a scale that never moves — so you set the hand, not the bezel. That is a different operation from the Black Bay GMT, whose bezel is specified as bidirectional and rotatable with an anodised aluminium disc.

Two references, one calibre

The Manufacture Calibre MT5652 appears on both this reference and the Black Bay GMT: COSC certified, self-winding with a bidirectional rotor system, built-in architecture, and approximately 70 hours of reserve.

So the movement does not tell you which watch you have. The bezel does, and so does the case size: 39mm here against 41mm on the GMT.

That is worth internalising because it is the commonest way a listing goes wrong. "Manufacture calibre MT5652, 70-hour reserve, COSC" is true of two different watches at two different prices.

Riveted, and what that means for wear

The bracelet is specified as riveted steel with polished and satin finish.

The rivet styling places raised detail along the outer edges of the outer links — a design reference to mid-century bracelets. It looks right and it creates edges, and edges are where a bracelet accumulates its wear.

Run a thumbnail along the outer links and look at the rivet detail under a loupe. Flattening there is the clearest record of how much the watch has actually been worn, far more so than the case, which can be refinished.

Then hold the bracelet horizontally from one end and watch for droop. Stretch at the pins is the fault that matters commercially.

The T-fit clasp

The clasp is a TUDOR T-fit with rapid adjustment — a few millimetres of toolless length change in defined steps.

It is the most frequently used mechanism on the watch and it lives where nobody inspects it. Work it through every position in both directions. Each should engage with a clear detent and hold under a firm pull; a T-fit that slides is a genuine fault and is invisible in any photograph.

Case, crystal and crown

39mm steel, polished and satin finished, 200 metres, a screw-down crown with the TUDOR rose in relief, and a domed sapphire crystal over a black, domed dial.

The domed crystal is the exposed part: it stands above the bezel by design, so it meets door frames first. Sapphire does not scratch gradually — it chips — so tilt the watch and travel the crystal's edge under a raking light rather than looking straight down at it.

The stated cover is five years, transferable, needing neither registration nor scheduled servicing to stay valid. Second-hand, that makes the original sale date worth pinning down — time remaining on it is value you can quote.