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When buying a pre-owned Tudor North Flag, judge the specific watch, its documentation and the seller’s protections—not just the asking price. The reference covered here is 91210N; verify the reference on the actual watch because listings and configurations may differ. Use market figures only as rough asking-price comparisons, and treat water resistance as unverified unless there is a recent documented test.
Identify the 91210N before comparing listings
Tudor’s March 2015 brochure identifies the North Flag as reference 91210N. It describes a 40 mm satin-finished 316L stainless-steel case, a steel and matt-black ceramic double bezel, screw-down crown, sapphire crystal, and an open caseback with sapphire crystal. The original water-resistance rating is 100 metres (330 feet). These are reference checks, not proof that a particular watch is authentic or still functioning within specification. Tudor’s 2015 North Flag brochure
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The brochure specifies the automatic MT5621 caliber, COSC certification, date, stop-seconds and approximately 70 hours of power reserve. The dial has a power-reserve display. Its matte-black surface, white markers and hands, yellow five-minute markings and yellow seconds hand are useful visual details to compare against clear listing photographs. Tudor’s 2015 North Flag brochure
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The brochure shows an integrated satin-finished steel bracelet or a black leather strap with yellow stitching and yellow lining. Ask exactly what comes with the watch. For a bracelet example, check that the bracelet and clasp are present and ask whether spare links are included; for a strap example, confirm whether it is the original strap or an addition. Do not treat a seller’s description or photographs as proof of originality or completeness. Tudor’s 2015 North Flag brochure
#1 Best Overall
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What to request from the seller
Ask for sharp, well-lit photographs of the dial, case sides, bezel, crown, caseback, clasp, bracelet links and reference or serial markings. Compare the visible features with the brochure, and request images of documents rather than relying on a listing’s “full set” or “serviced” label.
- Ask for the original warranty card and papers if the seller says they are included.
- Request dated service invoices or a Tudor Service Card, and ask what “serviced” means: who performed the work, when, and what was included.
- Get the seller’s authentication statement, warranty duration and coverage, return window, and payment protections in writing.
- Confirm the location, shipping cost, taxes or import charges, and whether the stated price includes them.
A dealer’s North Flag listing, for example, describes a watch with box and papers and a one-year seller warranty. That is an example of seller-specific terms, not a standard warranty for the model or for every dealer listing. Bob’s Watches’ North Flag listing
Rank #2
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How much does a Tudor North Flag cost?
As accessed on October 9, 2026, WatchPatrol reported a $3,186 median asking price and a $2,909–$3,349 middle-half range for its automatically matched North Flag listing sample. The same page showed asks from $2,200 to $4,195 in the referenced distribution. These are listing asks, not completed-sale values or an appraisal. WatchPatrol cautions that its matching uses seller-written titles and can misclassify listings, so use the figures only as a rough comparison anchor. WatchPatrol North Flag listings
Other marketplace pages show why one number can mislead: WatchCharts displayed listing examples around $2,999 and $3,399 and sold-listing records around $2,895–$3,495, while Chrono24 showed a small number of current listings with differing locations and prices. These examples are not a statistically robust completed-sale index; availability and geography affect what appears in a snapshot. WatchCharts North Flag 91210N page Chrono24 reference 91210N listings
Rank #3
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- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Compare like with like
For two candidate watches, compare the same reference and account for visible condition, included bracelet or strap and links, box and papers, service evidence, seller warranty and return terms, shipping, taxes, region and listing age. A complete set or recent official service can matter to a buyer, but the available marketplace figures do not establish a reliable universal dollar adjustment for either.
| Evidence | What it can tell you | What it cannot establish |
|---|---|---|
| Current asking-price snapshot | How some sellers are pricing matched listings at that time | The price a buyer will pay or the value of your specific watch |
| Sold-listing examples | Examples of recorded listings marked sold on a marketplace | A robust North Flag sale-price index |
| Box, papers or a service record | Supporting documentation to inspect and match to the watch | Authenticity or condition by itself |
How to assess service records
Tudor’s general guidance is to service its watches approximately every 10 years, depending on the model and day-to-day use. This is brand-wide guidance, not a North Flag-specific maintenance guarantee or evidence that a particular watch has been serviced. A dated record and the watch’s present condition are more useful for judging an individual example than age alone. Tudor guidance on watch maintenance
Rank #4
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Match the record to the watch
Ask for dated invoices or the Tudor Service Card. Tudor says a card is issued after a full service performed by an Official Tudor Retailer or Service Centre; it confirms service according to Tudor procedures and carries an international two-year guarantee. Check that the date, reference or serial identity, service provider and stated work agree with the seller’s account. Tudor guidance on watch maintenance
Find out what “full service” covered
Tudor describes a complete service as including a diagnostic examination and itemized estimate, movement overhaul, genuine replacement parts for worn or damaged components, replacement of all case seals, vacuum and pressure water tests, and condensation detection. The brand states that a complete service has a two-year Service Guarantee, subject to exclusions. Ask whether the seller’s claimed service was complete and request the supporting card or invoice. Tudor guidance on watch maintenance
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
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- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Do not assume a used North Flag is water resistant
The brochure’s 100 m rating is the model’s original specification; it does not show that an older watch’s seals remain sound. Unless the seller can provide a recent documented water-resistance test, treat water use as unverified. If water resistance matters to you, arrange an assessment by an Official Tudor Service Centre before exposing the watch to water. Tudor recommends that servicing be carried out by an Official Rolex or Tudor Service Centre. Tudor’s 2015 North Flag brochure Tudor guidance on watch maintenance
Quick Recap
Make the purchase decision on evidence
- Confirm the reference and compare the watch’s visible design and configuration with Tudor’s brochure.
- Review photographs of the key components and request documents supporting claims about papers, service and included parts.
- Compare the asking price with similar listings, adjusting your comparison for condition, configuration, location and seller protections rather than treating a market snapshot as a valuation.
- Before paying, get the return, warranty, authentication and payment terms in writing. If water resistance is important, require a recent test or arrange an assessment before use.
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.
