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Tudor · Black Bay One

Strap for Black Bay 36 S&G / Silver - Diamond / Bracelet

Takes 19 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

19mm
19 mm strapsAll Tudor
Lug width19 mm
Case diameter36 mm
Reference79643-0007 (aka: M79643-0007)
FamilyBlack Bay One
MovementTudor caliber MT5400 Hours, Minutes, Seconds | Chronometer
CaseYellow Gold, Stainless Steel

Spring bar

Spring bars for Tudor

The right category for this model · choose the 19 mm size

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The Black Bay One 79643-0007 (aka: M79643-0007), seen from the bench

The Tudor Black Bay One 79643-0007 is a 36mm two-tone watch combining yellow gold and 316L stainless steel. It features the in-house MT5400 movement with COSC chronometer certification, 28,800 vph frequency, and 70-hour power reserve. The case measures 11.6mm thick with a 19mm lug width, unidirectional bezel with anodized aluminum insert, and applied indices on burgundy or black dial. This model represents Tudor's modern interpretation of classic proportions without aesthetic compromise.

Frequently asked questions

What is the lug width of the Tudor Black Bay One 79643-0007?

The Tudor Black Bay One 79643-0007 features a lug width of 19 millimetres. This measurement represents the distance between the horizontal pins anchoring the strap to the case. The 19-millimetre specification allows for serious quality strap compatibility whilst maintaining harmonious proportions relative to the 36-millimetre case diameter.

What is the best strap for the Tudor Black Bay One 79643-0007?

Optimal strap choice depends on intended usage. Alligator in hammered finish is the historical choice for bi-colour watches, enhancing the interplay between yellow gold and burgundy or black dials. Vegetable-tanned calf offers a more casual profile with narratable patina over time. Rubber guarantees performance in sustained moisture environments, ideal for frequent aquatic applications. Shell cordovan represents artisanal excellence for those prioritising durability and crystalline patina development.

How do I change the strap on the Tudor Black Bay One 79643-0007?

Strap replacement involves extraction of the horizontal pins anchoring the strap to the case lugs. Using a dedicated tool (spring bar tool), apply gentle vertical pressure to release the pin, then extract horizontally. The operation demands precision to avoid case scratching. It is advisable to entrust this procedure to specialist personnel, such as Casati Milano atelier, if prior experience is lacking.

Which aftermarket strap is compatible with the Tudor Black Bay One 79643-0007?

Any strap featuring a 19-millimetre lug width is compatible with the 79643-0007. Online on milanostraps.it you will find a curated selection of 19mm straps in alligator, calf, rubber and textiles, customisable in length, initials and thread colour. The Casati Milano atelier additionally offers artisanal bespoke straps with personal leather selection and 18-month warranty.

What is the lifespan of a leather strap for the Tudor Black Bay One 79643-0007?

A quality leather strap (alligator, calf, shell cordovan) under ordinary usage develops a lifespan of 3-5 years before replacement is warranted. Duration varies according to use frequency, climatic conditions and tannage method. Vegetable-tanned leather, whilst demanding greater care, develops a desirable patina over time. Rubber, by contrast, retains elastic properties for 2-3 years before hardening occurs.

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