Tudor Black Bay Monochrome Reference #: 7941A1A0NU

• Case: 41mm diameter, 13.6mm thickness, ~49-50mm lug-to-lug, stainless steel with polished bevels. 

• Movement: Manufacture Calibre MT5602-U (COSC and METAS certified), automatic, 70-hour power reserve, anti-magnetic to 15,000 gauss. 

• Bezel: Unidirectional rotating stainless steel with a matte black aluminum insert (60-minute scale). 

• Dial: Domed black dial with a sunray finish, silver-colored applied hour markers, and "snowflake" hands filled with Super-LumiNova.  No date window.

• Bracelet/Strap Options: Available on a rubber strap, a "rivet-style" steel bracelet, or a 5-link "Jubilee-style" steel bracelet. All feature the T-Fit clasp. 

• Water Resistance: 200 meters.

• Crystal: Domed sapphire with no cyclops (due to no date). 

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. 

• 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. 

• Frequency: 28,800 vibrations per hour (4 Hz). 

• Power Reserve: Approximately 70 hours ("weekend-proof"). 

• Jewels: 25.

• Dimensions: 31.8mm diameter, 6.5mm thickness. 

• Balance Spring: Non-magnetic silicon hairspring. 

• Oscillator: Variable inertia balance wheel with micro-adjustment screws, secured by a traversing bridge for enhanced shock resistance. 

• Functions: Central hours, minutes, and seconds; hacking seconds (stop-seconds) for precise time setting. 

• Winding: Bidirectional rotor system; hand-windable. 

• 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."