Tudor · Black Bay One

Strap for Heritage Black Bay 41 Silver / Black Fabric

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
Reference79540-0012 (aka: M79540-0012)
FamilyBlack Bay One
MovementTudor caliber T600 Hours, Minutes, Seconds
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 One 79540-0012 (aka: M79540-0012)

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Black Bay One 79540-0012 (aka: M79540-0012), seen from the bench

The Tudor Black Bay One 79540-0012 is a 41mm stainless steel sports watch featuring the automatic Tudor Calibre T600 movement with Breguet hairspring, certified to -4/+6 seconds per day. The dial displays applied Roman numerals and a Mercedes hand, with 200 meters water resistance. The 22mm lug width ensures balanced proportions on the 41mm case, designed for recreational diving and daily wear with a distinctive bezel-less design.

Frequently asked questions

What is the lug width of the Tudor Black Bay One 79540-0012?

The Tudor Black Bay One 79540-0012 features 22mm lugs. This measurement, taken between the attachment pins on the case, is the standard for Tudor sports diving watches of this generation. Do not confuse lug width with case diameter: lug width determines solely the mechanical compatibility of the strap.

What is the best strap for the Black Bay One 79540-0012?

Alligator leather in vegetable tanning represents the most aesthetically coherent choice with the model's vintage and sports heritage. Havana brown tone dialogues naturally with the dark blue dial, creating an elegant contrast. Valid alternatives include vegetable-tanned calf for a restrained look, cotton NATO straps for military functionality, and FKM rubber for intensive aquatic use.

How do I change the strap on a Tudor Black Bay One 79540-0012?

Use a dedicated spring bar tool: position the tip into the lateral slot of the pin and push gently inward to release the lug. Repeat the process on both sides. Installation of the new strap follows the reverse procedure. To avoid case damage, work on a soft surface such as a rubber or leather mat.

Can I use an aftermarket strap on a Tudor Black Bay One 79540-0012?

Yes, any strap with a 22mm lug width is mechanically compatible. However, the choice of material and finish affects overall aesthetic harmony. Avoid straps with artificial texture or pastel colours, which clash with the Black Bay One's functionalist character. Artisanal straps in vegetable-tanned leather or alligator maintain coherence with Tudor's constructive philosophy.

How long does a leather strap last on a Tudor Black Bay One 79540-0012?

A strap in vegetable-tanned leather, used daily with ordinary care, maintains mechanical functionality for approximately 18–24 months. Durability depends on intensity of use, UV exposure and ambient humidity. Vegetable tanning develops an authentically aged patina within the first year, enhancing aesthetic appeal. Regular conservative treatments (neutral creams, not water-proofing products) extend the strap's 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