Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errors“Tudor North Flag” can mean two different watches: the original 2015 reference 91210N, known for debuting Tudor’s first manufacture movement and its dial-side power-reserve display, or the 2026 Northflag, a new-design GMT with Master Chronometer certification. The generations share a name, but not a movement or feature set.
Why the original North Flag mattered
Introduced in 2015, the North Flag was the first Tudor model fitted with the brand’s first manufacture calibre, MT5621. Its self-winding movement displayed the power reserve on the dial alongside the time and date—an unusual feature for the model and a defining part of its identity. Launch coverage reported an approximately 70-hour reserve, a silicon balance spring and COSC chronometer certification. Hodinkee’s 2015 introduction covers the original launch and movement.
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Tudor Royal Automatic Salmon Dial Men's Watch M28600-0009 | $2,900.00 | Buy on Amazon |
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Tudor Heritage Black Bay GMT Stainless Steel Automatic Mens Watch M79830RB-0001 | $4,650.00 | Buy on Amazon |
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Tudor | $2,950.00 | Buy on Amazon |
| 4 |
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Compatible with Tudor North Flag model M91210N - Men's textured fluoroelastomer strap with genuine... | $99.99 | Buy on Amazon |
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Tudor’s account of the name connects “North” with the British North Greenland Expedition and identifies the 1973 Ranger II as inspiration for the design. That is brand-stated lineage, not evidence that the modern watch reproduces an expedition watch. The original model is reported to have left the line around 2021; that discontinuation timing comes from retrospective industry coverage rather than an official announcement. Hodinkee’s retrospective and Teddy Baldassarre’s overview discuss its run.
What is different about the 2026 Northflag?
Tudor brought the Northflag name back in 2026, but describes the watch as having a new design and GMT function, not as a straightforward reissue. The current reference, M9140G1A0U-0001, replaces the original’s power-reserve display with a GMT complication and uses calibre MT5652-U. Tudor specifies a 65-hour power reserve and COSC and METAS certification, described by the brand as Master Chronometer certification. Tudor’s Northflag family listing and 2026 announcement present the returned model.
#1 Best Overall
- Tudor Royal Automatic Salmon Dial Men's Watch M28600-0009
| Feature | Original North Flag (91210N) | 2026 Northflag (M9140G1A0U-0001) |
|---|---|---|
| Movement | MT5621; time, date and dial-side power-reserve indicator | MT5652-U; time, date and GMT |
| Power reserve | Approximately 70 hours, as reported in 2015 launch coverage | 65 hours, per Tudor’s current specification |
| Certification | COSC, according to launch coverage | COSC and METAS / Master Chronometer, according to Tudor |
| Buying route | Reported discontinued around 2021; look to pre-owned sellers | Listed in Tudor’s 2026 catalog; US-facing displayed price of $5,525 |
The reserve figures refer to different movements and sources: the original’s approximate figure is from contemporary reporting, while the returned model’s figure is a current manufacturer specification. They are not a head-to-head test of performance.
2026 Northflag specifications to check
Tudor’s official reference page lists a 40 mm stainless-steel case, 12.7 mm thickness and 100 m water resistance. These are manufacturer specifications, not independent measurements or test results. The watch has a fixed steel bezel, domed sapphire crystal, screw-down crown and transparent caseback. Its integrated steel bracelet uses a two-link design and a tool-free T-fit clasp; Tudor says the clasp provides five positions across an 8 mm adjustment window. The M9140G1A0U-0001 product page lists the reference’s specifications.
Rank #2
- 41mm steel case with polished and satin finish
- Bidirectional rotatable bezel in steel with 24-hour graduated anodised aluminium disc
- Self-winding mechanical movement with 70 hour power reserve
The stated water resistance is a product rating, not a promise about the condition of a particular pre-owned watch. If considering a used example, ask the seller about its service history and water-resistance testing rather than assuming the original rating still applies.
Which generation should you look for?
Choose the original if you want its defining display
The 91210N is the version to seek if the MT5621 and its visible power-reserve indicator are the reason you are interested in the North Flag. Because it is reported discontinued, availability depends on the pre-owned market; no current inventory or second-hand price is established here.
Rank #3
- Water resistance depth: 100.0 meters
- Case diameter: 38.0 millimeters
- Item shape: Round
- Department name: mens
- Calendar type: Date
Choose the 2026 model if you want a GMT
The returned Northflag is the relevant version if you want a second time-zone function, current catalog availability through Tudor’s listed range, and the brand’s COSC-and-METAS certification claim. It has a new design and a different movement, so treat it as a distinct generation rather than assuming it is the 2015 watch with a minor update.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Price and pre-owned buying checks
Tudor’s US-facing family listing displayed a price of $5,525 for the 2026 Northflag in 2026. That is an official displayed price for that market and date context—not a universal price, a guarantee of local availability, or a street-price survey. Check the manufacturer’s current regional listing and an authorized seller for the price applicable to your location.
Rank #4
- .Hand-stitched with high-strength nylon thread, it is sturdy and less likely to crack
- Easy to install and replace without tools
- Special surface treatment, resistant to daily splashing water and sweat erosion.
- Skin-friendly leather inner layer, no indentation after long-term wearing
- Worry free after-sales service: We provide a "180 day worry free replacement" service. Is the strap fading? Does the texture not match? If there is no human damage, we will replace it directly! If you need customization, please contact customer service. Welcome to your purchase
For an original 91210N, compare individual listings rather than relying on an assumed current market price. Before buying, check:
Quick Recap
- Seller reputation and whether the watch’s reference and movement are documented.
- Authenticity documentation and whether the serial and paperwork are consistent with the offered watch.
- Service history, stated condition and any replaced parts.
- Whether the seller can provide a recent water-resistance test, if that matters to your use.
- The return policy and the process for resolving authenticity or condition disputes.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
