Strap for Black Bay One 36 Stainless Steel / Black / Bracelet

The lug width of the Tudor Black Bay One 79640-0001 is 20 millimetres. This dimension represents the distance between the attachment points of the lugs on the case. Measuring precisely is essential for acquiring a compatible strap: a digital calliper is positioned perpendicularly between the inner points of the lugs, at the centre of the case.

The ideal strap depends on intended use. For formal character, black or dark brown alligator elevates the instrumental elegance of the steel case. For those preferring leather that ages visibly, vegetable-tanned calf develops patina over time, synchronising with the watch's ageing. For sports or marine use, a navy NATO strap echoes Tudor's historical codes, whilst vulcanised FKM rubber offers thermal comfort and water resistance.

Strap replacement involves removing the spring bars that link the lugs to the case. These bars are spring-loaded and protrude slightly on one end: a spring bar tool is used to compress the internal spring and release the old strap. The new 20mm strap is inserted by aligning the ends to the lugs and releasing the bar until fully seated. The operation requires no specialised tools, only care to avoid scratching the case.

Yes, the 79640-0001 accepts any aftermarket strap with a 20mm lug width, provided the strap is constructed for this specific width. On milanostraps.it you will find a complete selection of compatible 20mm straps, customisable in materials, colours and finishes. The important thing is to verify that replacement spring bars, if required, are compatible with the original Tudor diameter.

The durability of a leather strap depends on use, climate and material chosen. A high-quality alligator or calf typically resists between 5 and 8 years if subject to moderate daily wear, in temperate environments. Humid environments, prolonged sun exposure and intensive water use accelerate ageing. Vegetable-tanned leather, though more delicate, develops desirable patina over time. To extend durability, we recommend rotating between different straps and periodically applying protective treatments (neutral creams for aniline leather).