- Movement - Manufacture Calibre MT5450-U (COSC and METAS certified)
Self-winding mechanical movement with bidirectional rotor system Integrated GMT function
- Bracelet - Five-row polished and satin steel with safety catch, folding clasp and T-Fit manual adjustment
- Case Diameter - 39mm
- Dial - Black, domed, with gilt applied hour markers
- Bezel - 24-hour bidirectional rotatable bezel in stainless steel with black and burgundy anodised aluminium insert
- Waterproof to 200 m (660 ft)
- Power reserve - Certified 65 hours by METAS
- Crystal - Domed sapphire crystal
- 5 years Warranty - with no registration or periodic maintenance checks required
In the Black Bay 58 GMT, the case offers the proportions of a 39mm case with a thinner profile than a 41mm Black Bay GMT. The bidirectional rotatable bezel offers very prehensible sides and its insert shows subtly curved numerals aligning with the outline of the outer ring. However, the aesthetic details don’t stop at the case dimensions and bezel. The seconds hand recalls the look of the brand’s early divers’ watches with a lollipop design, while the satin black dial is softly radial-brushed for a very subtle shine under direct light. Ergonomics have evolved as well, with a redesigned crown, reminiscent of the curves found on the crowns of the brand's historical technical watches, that is set flush to the middle case band so that its tube is not visible.
