Tudor · Black Bay 58

Strap for Black Bay Fifty-Eight Stainless Steel / Inter Milan

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter39 mm
ReferenceM79030N-0025
FamilyBlack Bay 58
MovementTudor caliber MT5402 Hours, Minutes, Seconds | Chronometer
CaseStainless Steel

Spring bar

Spring bars for Tudor

The right category for this model · choose the 20 mm size

Straps for the Black Bay 58 M79030N-0025

Selected for the 20 mm lug width · workshop selection

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The Black Bay 58 M79030N-0025, seen from the bench

The Black Bay 58 features the automatic caliber MT5402 with chronometer certification and hour, minute and second functions. The case has 20mm lugs for the strap. The movement offers certified chronometric performance according to COSC standards.

Frequently asked questions

What is the lug width of the Tudor Black Bay 58 M79030N-0025?

The Tudor Black Bay 58 M79030N-0025 features a lug width of exactly 20 millimetres. This measurement is taken from the inside bottom of one lug to the inside bottom of the opposite lug, passing through the case. It is essential to verify this specification before purchasing an aftermarket strap to avoid compatibility issues or instability.

Which strap is most suitable for the Tudor Black Bay 58?

For the Black Bay 58, a vegetable-tanned alligator strap is recommended, as it pairs perfectly with the navy blue dial and bronze bezel. Shell cordovan is a premium alternative for those seeking a stiffer leather with an evolving patina. For more sporty occasions, a full-grain leather strap maintains aesthetic coherence without compromising on softness.

How do you change the strap on a Tudor Black Bay 58?

Strap replacement is performed via the lateral lugs of the case. Use a spring bar tool to remove the elastic pin that secures the strap to the lugs. Gently extract the old strap, insert the new one on the first lug, and ensure the pin enters the opposite seat correctly. Apply light pressure until you hear a confirmation click.

Is an aftermarket strap compatible with the M79030N-0025?

Yes, any strap with a 20mm lug width is compatible with the Black Bay 58 M79030N-0025. It is essential to verify that the strap is precisely 20mm and not 18mm or 22mm. Bespoke leather straps also allow customisation in length to accommodate different wrist sizes.

How long does a leather strap last on a Tudor?

A high-quality leather strap on a diving watch such as the Black Bay 58 typically lasts 2-3 years with continuous use and proper maintenance. Vegetable-tanned leather ages naturally, acquiring a darker and richer patina. Prolonged exposure to salt water and intense sunlight shortens durability; periodic protection with specific creams extends the lifespan of the material.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only