What should a dealer check before buying a TUDOR M9140G1A0U-0001?

Treat a damaged bracelet as close to terminal. A 12mm integrated lug width means there is no aftermarket strap to fall back on, so the bracelet is not a replaceable accessory here. Sight along the integrated end links where they meet the case. Any gap or misalignment is immediately visible on this design and cannot be hidden by a strap change. Set the GMT hand through a full 24 hours and confirm it tracks the graduated rehaut correctly at both ends of the range. Inspect the open caseback crystal for hairlines. It is sapphire, it is exposed on the wrist side, and a marked one is both visible and awkward to replace. Check the rapid-adjust clasp holds its setting under load rather than creeping, since an integrated bracelet gives you no other way to fine-tune the fit.

What size is the TUDOR M9140G1A0U-0001?

TUDOR publishes reference M9140G1A0U-0001, the Northflag, as 40 mm in diameter, 12.7 mm thick, 12 mm between the lugs.

What is the water resistance of the TUDOR M9140G1A0U-0001?

TUDOR states the water resistance of reference M9140G1A0U-0001 as: Waterproof to 100m (330 ft). That figure describes the watch as built, and is not a measurement of any particular used example.

What movement does the TUDOR M9140G1A0U-0001 use?

The Northflag M9140G1A0U-0001 runs the Manufacture Calibre MT5652-U. TUDOR describes it as self-winding mechanical movement with bidirectional rotor system, integrated GMT function. The stated power reserve is 65-hour power reserve. Certification: COSC and METAS certified.

Is the TUDOR M9140G1A0U-0001 still in production?

TUDOR lists reference M9140G1A0U-0001 as current. Specifications on this page were read from TUDOR's own documentation on 2026-09-22, and the manufacturer's current documentation governs.

TUDOR · Northflag

TUDOR Northflag M9140G1A0U-0001: specifications and what to check

Name: TUDOR Northflag, 40mm black dial GMT
Brand: TUDOR
SKU: M9140G1A0U-0001

An integrated-bracelet GMT with a 12mm lug width, which is the number that defines ownership of it: there is no strap market here, so the bracelet is effectively part of the watch.

Reference M9140G1A0U-0001 · specifications read from the manufacturer on 2026-09-22 · listed as current

Specifications

As published by TUDOR. A field the manufacturer does not state is left out rather than filled in.

Case: 40mm stainless steel case with satin-brushed and polished finishes
Diameter: 40 mm
Thickness: 12.7 mm
Lug width: 12 mm
Water resistance: Waterproof to 100m (330 ft)
Crystal: Domed sapphire crystal
Bezel: Fixed stainless steel bezel with satin-brushed and polished finishes
Dial: Black dial with 24-hour graduated rehaut, date at 3 o'clock, "Northflag" hands and hour markers with Swiss Super-LumiNova
Case back: Open case back with domed sapphire crystal
Crown: Stainless steel screw-down cone-shaped winding crown with the TUDOR shield in relief
Bracelet: 2-link integrated bracelet in stainless steel, satin-brushed and polished finishes
Clasp: TUDOR "T-fit" rapid adjustment clasp

Movement

Calibre: Manufacture Calibre MT5652-U
Type: Self-winding mechanical movement with bidirectional rotor system, integrated GMT function
Power reserve: 65-hour power reserve
Certification: COSC and METAS certified
Notes: The GMT is described by TUDOR as an integrated function rather than a module.

What to check before you buy

Treat a damaged bracelet as close to terminal. A 12mm integrated lug width means there is no aftermarket strap to fall back on, so the bracelet is not a replaceable accessory here.
Sight along the integrated end links where they meet the case. Any gap or misalignment is immediately visible on this design and cannot be hidden by a strap change.
Set the GMT hand through a full 24 hours and confirm it tracks the graduated rehaut correctly at both ends of the range.
Inspect the open caseback crystal for hairlines. It is sapphire, it is exposed on the wrist side, and a marked one is both visible and awkward to replace.
Check the rapid-adjust clasp holds its setting under load rather than creeping, since an integrated bracelet gives you no other way to fine-tune the fit.

Twelve millimetres changes everything

The specification that matters most on this reference is the one most easily overlooked: a 12mm lug width on an integrated two-link bracelet. That is not a strap size. It is a statement that the bracelet and the case were designed as one object.

For a dealer, the consequences are practical and expensive. A stretched, scratched or incomplete bracelet cannot be solved by fitting something else, because there is nothing else to fit. Any watch of this type should be valued as case-plus-bracelet, with the bracelet weighted far more heavily than you would on a conventional 20mm lug watch.

Missing links are the same problem in miniature. Confirm the sizing works for the buyer you have before you commit.

A GMT built in, not bolted on

TUDOR describes the MT5652-U as carrying an integrated GMT function, and the dial is laid out for it with a 24-hour graduated rehaut. Certification is both COSC and METAS.

Run the complication properly on inspection rather than glancing at it. A GMT hand that drifts against the rehaut, or fails to track cleanly through a full rotation, is a movement fault rather than a setting quirk, and it is the sort of thing that surfaces after a sale rather than before.

An exposed sapphire caseback

The open caseback with a domed sapphire crystal is an unusual choice on a sports watch and an inspection point most people skip. It faces the wrist, it is glass, and it collects hairlines from desk edges and buckles.

Look at it off the wrist under light. Replacing a marked display back is not a catastrophe, but it is a cost, and it is invisible in every photograph a seller will send you.

Rated for splashes, not diving

100 metres and a fixed bezel. This is not a dive watch and does not pretend to be one, but it sits in a catalogue full of watches that are — so describe it precisely rather than borrowing language from elsewhere in the range.

Price references like this, faster

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Sources

TUDOR official product page for reference M9140G1A0U-0001 (Northflag; 40mm steel case; black dial) - Case: 40mm stainless steel case with satin-brushed and polished finishes; open case back with domed sapphire crystal; Lugs: 12mm lug width; Case thickness: 12.7mm; Waterproofness: waterproof to 100m (330 ft); Bezel: fixed stainless steel bezel with satin-brushed and polished finishes; Dial: black dial with 24-hour graduated rehaut; date at 3 o'clock; Northflag hands and hour markers with Swiss Super-LumiNova luminescent material; Crystal: domed sapphire crystal; Movement: Manufacture Calibre MT5652-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 cone-shaped winding crown with the TUDOR shield in relief; Bracelet: 2-link integrated bracelet in stainless steel; satin-brushed and polished finishes; with TUDOR T-fit rapid adjustment clasp — retrieved 2026-09-22

Not affiliated with TUDOR. Specifications are read from the manufacturer's own published documentation on the date shown and may change; the manufacturer's current documentation governs.