Tudor · Black Bay 58

Strap for Tudor Black Bay 58 M79030N

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
FamilyBlack Bay 58
MovementTudor caliber MT5402 Hours, Minutes, Seconds | Chronometer

Spring bar

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

Straps for the Black Bay 58 M79030N

Selected for the 20 mm lug width · workshop selection

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The Black Bay 58 M79030N, seen from the bench

The Tudor Black Bay 58, introduced in 2018, is a reinterpretation of the brand's 1950s dive watch model. It is equipped with the automatic MT5402 caliber, certified as a chronometer, and functions include hours, minutes, and seconds. The stainless steel case measures 39mm with 20mm lugs.

Frequently asked questions

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

The lug width of the Tudor Black Bay 58 M79030N is 20mm. This reduced width corresponds to the historical proportions of the 39mm case and ensures perfect seating between the lugs with maximum stability. To verify the measurement, position a calliper between the inner edges of the two lugs: the result must be exactly 20mm.

Which strap is most suitable for the Tudor Black Bay 58 M79030N?

The ideal strap depends on intended use. For formal-sporty styling, vegetable-tanned alligator is perfect; for frequent diving, water-resistant calf leather is recommended; for intensive underwater use, vulcanised rubber guarantees maximum grip; for urban versatility, a Cordura NATO offers the best compromise between practicality and visual appeal.

How do you change the strap on a Tudor Black Bay 58 M79030N?

To change the strap, you will need a standard strap removal tool. Insert the tool into the side hole of the lug from one side, gently push the pin outward until fully extracted, then release the strap. Repeat on the opposite side. To install the new strap, align the lugs with the case holes and reinsert the pins with reverse movement, ensuring they are fully seated.

Is an aftermarket 20mm strap compatible with the Tudor Black Bay 58 M79030N?

Yes, any strap with a 20mm lug width is compatible with the M79030N, provided the attachment pins are the correct size. Bespoke crafted straps offer additional personalisation in terms of length, leather type and thread colour, whilst maintaining complete mechanical compatibility with the case.

How long does a leather strap last on a Tudor Black Bay 58 M79030N?

A quality leather strap typically lasts 4-6 years with regular wear, subject to variables such as frequency of use, humidity exposure and care. Vegetable-tanned alligator tends to develop a noble patina over time; calf resists humidity better if periodically treated with protective balm. The typical 18-month warranty covers manufacturing defects and stitching.

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