Tudor · Black Bay

Strap for Heritage Black Bay Black Manufacture / L'Italiano

Takes 22 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width22 mm
Case diameter41 mm
Reference79230N-0004
FamilyBlack Bay
MovementTudor caliber MT5602 Hours, Minutes, Seconds | Chronometer
CaseStainless Steel

Recommended spring bar

Modern Tudor 22mm spring bars — factory specification

Technical match for lug width and diameter · lug 22 mm · Ø 1.8 mm

All Tudor spring barsOpen →

Straps for the Black Bay 79230N-0004

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Black Bay 79230N-0004, seen from the bench

The Black Bay represents Tudor's line of dive watches, equipped with the automatic caliber MT5602 with chronometer certification. The movement offers indication of hours, minutes and seconds with extended power reserve. The case features 22mm lugs and maintains the classic proportions of the brand's dive watches.

Frequently asked questions

What is the lug width of the Tudor Black Bay 79230N-0004?

The lug width of the Tudor Black Bay 79230N-0004 is 22 millimetres. This specification is fixed for this model and represents the net distance between the case lugs. When replacing the original strap, it is essential to ensure that the new strap is manufactured with the same 22mm lug width to guarantee correct fit and compatibility with the case attachment pins.

What is the best aftermarket strap for the Tudor Black Bay 79230N-0004?

The optimal strap choice depends on intended use. For formal elegance and sophistication, vegetable-tanned alligator in deep brown tones develops a refined patina over time. For versatility and marine resistance, full-grain calf with perceptible texture absorbs moisture effectively. A premium NATO canvas maintains the tool watch's military heritage without compromise. Vulcanised rubber is ideal for humid environments or sports activities. All recommended straps must feature 22mm lug width compatibility.

How do I change the strap on a Tudor Black Bay 79230N-0004?

Strap replacement requires a dedicated spring bar removal tool. Position the tool beneath the lug pin, apply gentle perpendicular pressure to compress the internal spring, then extract the strap. Align the new strap's lug hole with the case pin, compress the spring again and release. Verify that the pin is securely seated. If inexperienced, consult a professional watchmaker to avoid damage to the case.

Is a 22mm aftermarket strap 100% compatible with the Tudor Black Bay 79230N-0004?

Yes, any strap manufactured with 22mm lugs is physically compatible with the Tudor Black Bay 79230N-0004, as lug width is the sole parameter determining mechanical coupling with the case pins. However, construction quality, fabric density (for textiles), leather thickness and deployant finish vary significantly between manufacturers. Milano Straps provides verified 22mm straps in leather and NATO, manufactured to artisanal standards and guaranteed for durability.

How long does an alligator leather strap last on a daily-wear watch?

An alligator strap subjected to vegetable tanning typically lasts 4-6 years with daily use, depending on exposure to moisture, chlorine, perspiration and cleaning frequency. Alligator is sensitive to saltwater and prolonged direct sunlight. Preventive treatment with neutral balm every 3-4 months significantly extends material lifespan. Full-grain calf resists slightly longer (6-8 years) due to greater flexibility, whilst vulcanised rubber straps can endure 8-10 years. Milano Straps offers an 18-month warranty on all straps crafted by the Casati Milano atelier.

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