TUDOR · TUDOR Royal and Northflag
TUDOR M2840D1A0-0001 vs TUDOR M9140G1A0U-0001
12 published specifications differ between these two, and 2 are identical. Every figure below is what the manufacturer states for that reference; nothing is inferred from the other watch.
What differs
| Specification | TUDOR Northflag, 40mm black dial GMTM9140G1A0U-0001 | |
|---|---|---|
| Case | 40mm stainless steel case with polished and satin finish | 40mm stainless steel case with satin-brushed and polished finishes |
| Crystal | Sapphire crystal | Domed sapphire crystal |
| Bezel | Stainless steel bezel | Fixed stainless steel bezel with satin-brushed and polished finishes |
| Dial | Black dial with applied stick hour markers, date at 3 o'clock, day at 12 o'clock | Black dial with 24-hour graduated rehaut, date at 3 o'clock, "Northflag" hands and hour markers with Swiss Super-LumiNova |
| Crown | Stainless steel screw-down winding crown with the TUDOR logo in relief | Stainless steel screw-down cone-shaped winding crown with the TUDOR shield in relief |
| Bracelet | 5-link integrated bracelet in stainless steel, satin-brushed external and central links, polished intermediate links | 2-link integrated bracelet in stainless steel, satin-brushed and polished finishes |
| Clasp | TUDOR T-fit folding clasp with safety catch | TUDOR "T-fit" rapid adjustment clasp |
| Calibre | Manufacture Calibre MT5633 | Manufacture Calibre MT5652-U |
| Movement | Self-winding mechanical movement with bidirectional rotor system | Self-winding mechanical movement with bidirectional rotor system, integrated GMT function |
| Power reserve | Approximately 70 hours | 65-hour power reserve |
| Certification | COSC, tuned to −2/+4 seconds | COSC and METAS certified |
| Movement notes | TUDOR states a five-year transferable guarantee with no registration or periodic maintenance checks required. | The GMT is described by TUDOR as an integrated function rather than a module. |
What is identical
Worth knowing as much as the differences: these are the specifications you cannot use to tell the two apart.
- Diameter
- 40 mm
- Water resistance
- Waterproof to 100m (330 ft)
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 | not stated | 12.7 mm |
|---|---|---|
| Lug width | not stated | 12 mm |
| Case back | not stated | Open case back with domed sapphire crystal |
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 M2840D1A0-0001 runs the Manufacture Calibre MT5633 and the M9140G1A0U-0001 the Manufacture Calibre MT5652-U. 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
M2840D1A0-0001
- Treat the bracelet as part of the case. It is specified as integrated, so a damaged or missing bracelet is not solved by fitting a strap and a replacement is model-specific.
- Quote the published tolerance of minus two to plus four seconds a day. TUDOR states a tuned figure here beyond COSC certification, which is a stronger claim than most sheets offer.
- Set the day and the date separately across midnight and confirm both index cleanly. The day wheel is the component most often damaged by careless setting.
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.
Sources
- TUDOR official product page for reference M2840D1A0-0001 (TUDOR Royal 40; steel; integrated bracelet; day and date) - Case: 40mm stainless steel case with polished and satin finish; Waterproofness: Waterproof to 100m (330 ft); Bezel: Stainless steel bezel; Dial: Black dial, applied stick hour markers; date at 3 o'clock; day at 12 o'clock; Crystal: Sapphire crystal; Movement: Manufacture Calibre MT5633 (COSC), tuned to -2/+4 seconds; self-winding mechanical movement with bidirectional rotor system; Power Reserve: Power reserve of approximately 70 hours; Winding Crown: Stainless steel screw-down winding crown with the TUDOR logo in relief; Bracelet: 5-link integrated bracelet in stainless steel, satin-brushed external and central links, polished intermediate links, with TUDOR T-fit folding clasp and safety catch; Guarantee: Five-year transferable guarantee with no registration or periodic maintenance checks required — retrieved 2026-09-23
- 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 each manufacturer's own published documentation on the dates shown and may change; the manufacturer's current documentation governs.