Model Reference
BUY PRE-OWNED TUDOR NORTH FLAG 91210N WATCHES
Production Years:
The TUDOR North Flag 91210N arrived in 2015 and remained part of the collection until around 2020, so the supplied 2016 introduction date should be corrected. Its arrival was significant for a reason that went beyond the design of the watch itself: the North Flag was the model TUDOR chose to introduce its first manufacturing movement, the MT5621. That made the reference an important technical step for the brand at a time when TUDOR was moving away from its reliance on externally supplied base movements.
The North Flag was also visually separate from the heritage led watches that were becoming increasingly important to TUDOR during the same period. Instead of reproducing the appearance of an earlier model, the 91210N used a contemporary 40mm case, an integrated bracelet or leather strap arrangement and a dial designed around its power reserve display. Its production run was relatively short, and the North Flag was eventually discontinued without a direct successor, leaving the 91210N as a particularly self contained chapter in the modern TUDOR catalogue.
Defining Features
The North Flag is easy to recognise without looking at its reference number because very few TUDOR watches arrange information in the same way. The matte black dial places a date window at 3 o'clock and an analogue power reserve indicator at 9 o'clock, with yellow details used selectively across the display. The indicator allows the wearer to see how much energy remains in the movement rather than having to judge it from how long the watch has been off the wrist.
A yellow tipped seconds hand introduces another small colour accent, while large applied hour markers and luminous hands keep the dial clearly legible. Around it sits a fixed bezel combining steel with a black ceramic component, creating a sharper, more technical outline than the aluminium diving bezels associated with many TUDOR sports watches of the period.
The 40mm stainless steel case is predominantly satin finished, and its angular shape continues directly into the bracelet on reference 91210N. This integrated appearance is a major part of the North Flag's design because there is less visual separation between the watch head and bracelet than on a conventional sports watch with clearly exposed lugs. TUDOR also offered the North Flag with a black leather strap with yellow stitching, but the 91210N designation is associated with the steel bracelet configuration. A sapphire crystal protects the dial, and the screw down crown contributes to a water resistance rating of 100 metres. None of these details tries to make the North Flag resemble a vintage diving watch; its case, bracelet and dial were conceived as a modern design in their own right.
About Tudor North Flag 91210N
Much of the importance of the North Flag is hidden behind its dial. The Manufacture Calibre MT5621 was TUDOR's first in house manufacture movement when it appeared in 2015, and the company gave the North Flag a sapphire caseback so that the movement could actually be seen. This was an unusual decision for TUDOR at the time and remains one of the details that distinguishes the 91210N from many other references in the brand's catalogue.
The automatic MT5621 is COSC chronometer certified, uses a silicon balance spring and provides approximately 70 hours of power reserve. Instead of leaving that reserve as a specification in a manual, TUDOR connected it to the indicator at 9 o'clock, allowing the owner to see the remaining state of wind while wearing the watch.
The name connects the modern design to an earlier part of TUDOR's history. Members of the British North Greenland Expedition of 1952–1954 were equipped with TUDOR Oyster Prince watches during their work in Greenland, where the watches were exposed to demanding conditions. The North Flag drew on that exploration story without attempting to reproduce those 1950s watches visually.
This distinction matters because the 91210N is better understood as a modern exploration oriented watch informed by TUDOR history rather than a direct vintage recreation. Its angular case, yellow dial accents, visible movement and power reserve display make that clear. For collectors looking through pre owned TUDOR watches today, the North Flag therefore occupies an unusual position: it has historical significance because of the movement it introduced, yet its design belongs very specifically to the period in which it was made.
At a Glance
- 40mm Case
- Steel Case
- Leather Strap
- Black Dial
- Automatic Movement
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PRE-OWNED TUDOR NORTH FLAG 91210N WATCHES
Make sure to use BQ Watches if you’re trying to purchase pre-loved Tudor North Flag 91210N timepieces. You can browse our extensive online selection or come see it in person at the best watch store in London, UK. If you’re looking for a luxury watch from a brand such as Rolex, Audemars Piguet, Cartier, Bremont, Breitling, IWC, Tudor, Omega, Patek Philippe, or any other, you can always visit BQ Watches.
We are aware that occasionally our inventory won’t have the precise used Tudor North Flag 91210N watch you’re wanting to purchase. Please let our team know if that is the case. For our cherished customers, we are constantly prepared to source a watch. All you need to do is tell us what watch you want, and we’ll get to work finding it for you.
Why Buy a Pre Owned TUDOR North Flag 91210N?
The is one of the brand’s most distinctive modern sports watches, combining rugged styling with an important piece of TUDOR’s watchmaking history. Introduced in 2015, it was the first TUDOR to feature the brand’s manufacture movement, the COSC-certified Calibre MT5621, offering an impressive 70-hour power reserve. Its 40mm stainless steel case, matte black dial and striking yellow accents give it a contemporary, purposeful look, while the power reserve indicator at 9 o’clock and date display at 3 o’clock add everyday practicality.
With 100 metres of water resistance, a sapphire crystal and a design inspired by TUDOR’s exploration heritage, the North Flag is built for versatility. Discontinued in 2021, the original 91210N has become an interesting choice for collectors seeking something beyond the familiar Black Bay range. Buying pre-owned is an opportunity to own a distinctive and historically significant TUDOR that stands apart from the crowd.
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Here at BQ Watches, we strive to provide all types of service for your luxury item. We’ve been providing services to the UK and international markets for pre-owned Tudor North Flag 91210N watches for more than 30 years. When choosing us, our customers can always expect a welcoming and enjoyable experience to buy a watch. We can also set up the service for you if you want to exchange or sell your watch. We’ll provide you with a fantastic offer, making the selling procedure efficient and enjoyable.
In addition, if you require it, we provide expert cleaning, repair, and appraisal services. Not to mention, we also provide the greatest sourcing services for used Tudor North Flag 91210N watches. Our experts will go above and beyond to get you the ideal timepiece if you have a certain watch in mind. We’ll start working for you as soon as you give us the brand, model number, and any other pertinent information.
Simply fill out the contact form below to let us know what luxury watch service you require. Soon, a member of our staff will get in touch with you to assist you.
Why Choose BQ Watches for a Pre Owned TUDOR North Flag 91210N?
Condition tells an especially interesting story on a North Flag because so much of its exterior relies on satin finished steel and defined case edges. Previous polishing can change those surfaces, while regular use can leave marks on the integrated bracelet and clasp that need to be considered in the context of the whole watch. The power reserve indicator provides another reference specific point to examine, as it should correspond correctly with the state of wind of the MT5621, while the date, crown and automatic movement should operate as intended.
BQ Watches consider these individual details when you buy a pre owned 91210N, including the condition of the bracelet, case, ceramic bezel component, dial and visible movement rather than assessing the watch from its model name alone.
The North Flag's discontinued status and relatively unusual position in TUDOR's modern history can also make the specification of an individual piece relevant to an owner. Its condition, box, papers, bracelet links and other accompanying items can be considered as part of a valuation, while the same assessment can help if the watch is being used in an exchange for another reference. If you decide to sell, BQ Watches can assess the actual 91210N and its accompanying items rather than treating every North Flag as being in equivalent condition.
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