North Flag
History of the line
Presented at Baselworld in 2015 with reference 91210N, the North Flag marked an industrial turning point for the brand: it was the first Tudor watch to use a calibre of its own production, the MT5621, after decades in which the manufacture had relied on movements from outside suppliers. COSC-certified as a chronometer, with a 70-hour power reserve and silicon hairspring, the calibre paved the way for the vertical integration that in the following years would also extend to the Pelagos and Black Bay.
The name and design explicitly recall the historic role of Tudor watches in extreme polar expeditions, in particular the 1952-54 British North Greenland Expedition — the same legacy also evoked by the Ranger. A rugged 40 mm steel case, a fixed ceramic bezel with a 24-hour graduated scale, a power reserve indicator and date at 3 o'clock, and a dial with graphics recalling a compass and a star motif linked to polar navigation.
The model was withdrawn from the catalogue around 2019, when its role partly overlapped with that of the Black Bay and Pelagos, both of which had meanwhile moved to the same family of in-house calibres. For the brand's centenary celebrations, between 2025 and 2026, Tudor brought the line back in an updated version, with a GMT function and Master Chronometer certification — an explicit return of a cult model, confirming that in Tudor's recent history the North Flag remains a milestone rather than a closed chapter.
Technical specifications
Notable references
The North Flag is not just a model: it is the point at which Tudor stopped relying on third-party movements for the first time and began producing its own calibres, a step that in the following years would reshape the brand's entire catalogue, from the Pelagos to the Black Bay.