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The TUDOR Black Bay 58 is named after the year in which the first TUDOR divers’ watch waterproof to 200 metres, the reference 7924, dubbed the “Big Crown”, was introduced. Among other aesthetic allusions to this famous historic watch, this model has a 39mm diameter case, in keeping with the characteristic proportions of the 1950s. The watch is the perfect match for a GMT function, and with the Black Bay 58 GMT, the jet-setter’s ultimate function comes with a touch of mid-century elegance. The bezel is burgundy and black with a gilt 24-hour scale, keeping with the general design language of the Black Bay line. The design is reminiscent of a time when TUDOR divers' watches were first being made and jet planes were moving through times zones and delivering interlopers to destinations they could only dream of, faster than ever before. Finishing gilt touches have been applied to the hour markers, hands, and hour markers of the bicolour bezel. Another fan-favourite touch that remains on the Black Bay 58 GMT is the winding crown, which bears the TUDOR rose logo in relief.

KEY POINTS
“Original” Black Bay 58 proportions of a 39mm case in stainless steel with a 24-hour bidirectional black and burgundy bezel with gilt accents
Subtly domed matt black dial with gilt accents
“Snowflake” hands, a hallmark of TUDOR divers’ watches introduced in 1969, with Grade A Swiss Super-LumiNova® luminescent material
GMT Manufacture Calibre MT5450-U, certified by the Official Swiss Chronometer Testing Institute (COSC), with a silicon hairspring and a 65-hour power reserve
Master Chronometer certified by METAS
A choice between a stainless steel 3-link “rivet-style” bracelet or a rubber strap, both with TUDOR “T-fit” rapid adjustment clasp
Five-year transferable guarantee, with no registration or periodic maintenance checks required TUDOR QUALITY
With the introduction of this brand-new Black Bay 58 GMT, TUDOR has successfully submitted yet another model for tests to obtain Master Chronometer certification. This is part of a constant bid to improve the quality of its products and another step towards a future where the entire TUDOR collection will be Master Chronometer certified. This certification, offered by a Swiss government body, METAS, requires a substantial number of changes to a regular TUDOR Manufacture Calibre and comes as an independent confirmation of the exceptional quality of the TUDOR watches.

COMPREHENSIVE INDEPENDENT CERTIFICATION AND HIGH STANDARDS
METAS Master Chronometer certification is comprehensive and covers the main functional characteristics of a watch including precision, resistance to magnetic fields, waterproofness and power reserve. Its standards are incredibly high, starting with precision. In order to qualify, a watch must be able to function within a 5-second range of variation each day (0/+5), that is to say 5 seconds less than the Official Swiss Chronometer Testing Institute (COSC) (-4/+6) carried out on a single movement and a second less than TUDOR's internal standard (-2/+4), which is applied to the brand's models with a Manufacture Calibre. The certification also guarantees the timekeeping accuracy of a watch subjected to magnetic fields of 15,000 gauss. Finally, it also guarantees the waterproofness claimed by the manufacturer as well as the power reserve. It should also be noted that two prerequisites are necessary before the certification can be obtained: Swiss manufacturing must conform with the criteria of Swiss Made, and the movement must be certified by the Official Swiss Chronometer Testing Institute (COSC).

CRITERIA AND TESTS FOR MASTER CHRONOMETER CERTIFICATION BY METAS
All the tests and prerequisites leading to the Master Chronometer certification, which the Black Bay has achieved, are summarised below:

Swiss Made
Certification by the Official Swiss Chronometer Testing Institute (COSC)
Precision at two temperatures, in six positions and at two levels of power reserve: 100% and 33%
Smooth functioning when exposed to a magnetic field of 15,000 gauss and precision following exposure
Waterproof to 200m (660 ft)
65-hour power reserve

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