TUDOR Black Bay 58 Black Dial – Ref. M7939A1A0NU-0001

Master Chronometer Certification and Compact Heritage proportions

Experience the peak of modern Swiss horological precision with the TUDOR Black Bay 58 (Ref. M7939A1A0NU-0001). Named in celebration of 1958—the historic year TUDOR introduced its first divers’ watch waterproof to 200 meters, the famous Reference 7924 "Big Crown"—this model retains the iconic, compact 39mm case profile. Perfectly proportioned for optimal wrist comfort, the polished and satin-finished stainless steel case measures a slim 11.7mm in thickness. Elevating this legendary diver to elite status, this watch features Master Chronometer certification from METAS, guaranteeing exceptional magnetic resistance up to 15,000 gauss and a strict timekeeping tolerance array.

Framed by the case is a rich, matte black dial. It features vintage-inspired rose gold-tone hour markers and the characteristic angular "Snowflake" hands from TUDOR’s 1969 archive, all heavily coated in high-luminosity material for quick low-light tracking. The dial face is surrounded by a unidirectional 60-minute graduated black bezel featuring subtle gold-finished accents that beautifully echo mid-century dive instrument aesthetics.

In-House Manufacture Calibre and Exhibition Performance

Beneath the domed sapphire crystal beats the high-performance Manufacture Calibre MT5400-U. This self-winding movement operates at a high frequency of 28,800 vibrations per hour (4Hz), utilizing a non-magnetic silicon balance spring and a variable inertia oscillator to deliver a robust, "weekend-proof" 65-hour power reserve. In a striking evolution for the core steel Black Bay 58 family, this iteration features a transparent see-through case back, allowing collectors a direct view of the industrial-style mechanical architecture within.

True to its historic maritime pedigree, the large screw-down winding crown is embossed with the iconic TUDOR Rose, securing an authentic water resistance rating of 200 meters (660 feet). The watch is anchored by a matching stainless steel rivet-style five-link bracelet, combining a brushed top finish with polished side edges to complete a sophisticated look that transitions seamlessly from ocean expeditions to formal settings.

• Brand: TUDOR

• Collection: Black Bay 58

• Model Number: M7939A1A0NU-0001

• Movement: Manufacture Calibre MT5400-U Mechanical Self-Winding Automatic

• Certification: METAS Master Chronometer & COSC Certified

• Power Reserve: Approximately 65 Hours

• Case Material: Polished and Satin-Finished Stainless Steel

• Case Back: Transparent Sapphire Exhibition Window

• Bezel: Unidirectional Rotating Black Stainless Steel with Gold-Tone Graduated Disc

• Dial Presentation: Matte Black Dial with Rose Gold-Tone Snowflake Hands & Hour Markers

• Luminescence: High-Performance Luminescent Hands & Index Plots

• Crystal: Scratch-Resistant Domed Sapphire Crystal

• Case Dimensions: 39.0mm Diameter / 11.7mm Thickness

• Bracelet Configuration: Stainless Steel 5-Link Bracelet with Polished and Satin Finishes

• Water Resistance: 200 Meters (660 Feet) / 20 Bar

• Crown: Stainless Steel Screw-Down Crown with Raised TUDOR Rose