The Tudor Black Bay 41 (Ref. 7941A1A0NU) is powered by the Manufacture Calibre MT5602-U, a "Master Chronometer" automatic movement developed by Kenissi for Tudor. Introduced in 2023, this caliber is the METAS-certified evolution of the standard MT5602.
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Certification: Dual certified by COSC (Swiss Official Chronometer Testing Institute) and METAS (Federal Institute of Metrology). This guarantees a precision of 0 to +5 seconds per day (tested on the cased watch) and resistance to magnetic fields up to 15,000 gauss.
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Frequency: 28,800 vibrations per hour (4 Hz).
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Power Reserve: Approximately 70 hours ("weekend-proof").
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Jewels: 25.
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Dimensions: 31.8mm diameter, 6.5mm thickness.
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Balance Spring: Non-magnetic silicon hairspring.
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Oscillator: Variable inertia balance wheel with micro-adjustment screws, secured by a traversing bridge for enhanced shock resistance.
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Functions: Central hours, minutes, and seconds; hacking seconds (stop-seconds) for precise time setting.
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Winding: Bidirectional rotor system; hand-windable.
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Finishing: Features industrial finishing with laser-engraved sunray motifs on the plates and bridges, and a skeletonized rotor with a sand-blasted tungsten weight. The movement is explicitly marked "Master Chronometer."