Tudor · Black Bay 58

Strap for Black Bay Fifty-Eight Stainless Steel / Black / Bracelet

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
Reference79030N-0001 (aka: M79030N-0001, 79030N0001)
FamilyBlack Bay 58
MovementTudor caliber MT5402 hours, minutes, seconds | chronometer
Year2018
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 79030N-0001 (aka: M79030N-0001, 79030N0001)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Black Bay 58 79030N-0001 (aka: M79030N-0001, 79030N0001), seen from the bench

The Tudor Black Bay 58 model 79030N-0001 is a conscious reinterpretation of the legendary 1958 Submariner, maintaining the original 39mm case diameter rather than following contemporary oversized trends. The stainless steel case features a unidirectional rotating bezel and black dial with white gold applied indices. It houses the MT5402 movement, a Tudor in-house caliber developed with Rolex and COSC-certified chronometer, offering -4 to +6 seconds daily precision and 70-hour power reserve. The 20mm lug width accommodates the bracelet interface, sized proportionally for this 39mm case and offering 200 meters water resistance for recreational diving and daily wear.

Frequently asked questions

What is the lug width of the Tudor Black Bay 58 79030N-0001?

The Tudor Black Bay 58 79030N-0001 features a lug width (distance between the case lugs) of 20mm. This is the precise measurement where the strap sits between the case's lateral protrusions. Accurate measurement is essential to ensure compatibility when purchasing replacement straps.

Which is the best strap for the Tudor Black Bay 58 79030N-0001?

The optimal strap choice depends on intended use and personal preference. For authentic vintage aesthetics, vegetable-tanned calf leather emphasises the retro character; alligator provides formal elegance; FKM rubber ensures water resistance and daily practicality. A 5-ring NATO in canvas adds casual versatility whilst maintaining the correct case proportions.

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

The Tudor Black Bay 58 79030N-0001 uses straight lugs without curved spring bars. Using a spring bar tool, insert the tip into the small notch beneath the lug, gently lift until the spring bar releases, then remove the old strap. Repeat for the opposite lug. Handle carefully to avoid scratching the case: multiple changes require practice and patience.

Is an aftermarket strap compatible with the Tudor Black Bay 58 79030N-0001?

Yes, any 20mm strap is compatible, provided thickness remains between 1.4 and 1.6mm to maintain correct aesthetics. Avoid straps exceeding 2mm thickness, which would visually overweight the 39mm case. Many owners choose bespoke aftermarket straps for colour personalisation, leather selection and finishing details.

What is the lifespan of a leather strap on a Tudor Black Bay 58?

A quality leather strap, under ordinary daily wear, typically lasts 2–4 years before displaying visible degradation (fraying, creasing at flex points). Longevity depends on humidity exposure, perspiration and frequency of wear. Vegetable-tanned leathers age gracefully, developing patina; chromium-tanned leathers degrade more rapidly. Rotating between two or three straps significantly extends individual lifespan.

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