Yes. The original TUDOR North Flag, reference 91210N, uses the TUDOR Manufacture Calibre MT5621—an automatic, in-house-developed and manufactured movement. TUDOR stated a power reserve of approximately 70 hours and the movement is COSC-certified. A newer Northflag GMT uses a different caliber, MT5652-U, so its 65-hour reserve and METAS certification should not be applied to the original watch.
What movement is in the original TUDOR North Flag?
The original North Flag, introduced in 2015 as reference 91210N, is powered by Manufacture Calibre MT5621. TUDOR presented it as the brand’s first in-house-developed and manufactured mechanical movement. The company’s 2026 Japanese-language release also identifies MT5621 with the older North Flag. TUDOR / Nippon Rolex Co., Ltd., 2026 press release
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MT5621 is an automatic, self-winding movement with a bidirectional rotor and silicon balance spring. TUDOR’s 2015 technical specification lists a frequency of 28,800 beats per hour, or 4 Hz, and an approximately 70-hour power reserve. TUDOR 2015 technical specification
Why do some Northflag pages show a different movement?
TUDOR’s current Northflag family page presents a GMT version powered by Manufacture Calibre MT5652-U. That is a distinct configuration from the original 91210N with MT5621, not a revision to the original watch’s specifications. TUDOR Northflag family page
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| Version | Movement | Stated power reserve | Certification |
|---|---|---|---|
| Original North Flag, ref. 91210N | MT5621 | Approximately 70 hours, per TUDOR’s 2015 technical specification | COSC |
| Current Northflag GMT | MT5652-U | 65 hours, per TUDOR’s current family page | COSC and METAS |
The newer model’s specifications help explain why current search results may differ from older North Flag references. Keep the model and caliber together when checking a listing or documentation.
What does COSC certification say about accuracy?
MT5621 is COSC-certified, but certification is not a guarantee that every individual watch—especially a pre-owned example—currently keeps the same rate. TUDOR distinguishes the movement-level COSC tolerance from its own standard for a fully assembled manufacture-calibre watch:
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- COSC movement-level tolerance: -4/+6 seconds per day, as described by TUDOR for a movement tested on its own.
- TUDOR fully assembled-watch standard: -2/+4 seconds per day for its manufacture-calibre watches.
- METAS criterion: 0/+5 seconds per day for watches meeting the described Master Chronometer requirements.
These are standards and certification criteria, not a measurement of a particular North Flag’s present performance. TUDOR’s METAS explanation describes the distinction between the testing contexts. TUDOR METAS Certification
What should you check when evaluating a North Flag?
- Confirm the reference and caliber: the original 91210N is associated with MT5621.
- Use approximately 70 hours as the original MT5621’s stated reserve; 65 hours belongs to the current MT5652-U GMT.
- Treat COSC status as certification history, not proof of a used watch’s current daily rate. A current rate requires measurement of that individual watch.
TUDOR’s broader manufacture-calibre overview says its manufacture calibres were announced in 2015 and describes a general 70-hour reserve, 4 Hz frequency, silicon spring, and COSC certification. That context supports the brand’s movement history, but the original North Flag’s specifications are most directly established by its model-specific technical sheet. TUDOR Manufacture Calibre overview
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