Strap for Black Bay 39 S&G / Anthracite - Diamond / Bracelet

The lug width (or lug distance) of the Tudor Black Bay One 79663-0003 is 20mm. This measurement represents the distance between the two attachment pins situated on the lugs of the case. This proportion is characteristic of vintage models from the 1960s and has been retained in this contemporary reinterpretation. Verifying the correct lug width before purchasing a replacement strap is essential to avoid misalignment or undesirable friction.

For a two-tone Black Bay One in yellow gold and stainless steel configuration, recommended materials include natural alligator leather, deeply grained calf leather (buffalo grain), and pelts finished with vegetable tanning based on natural tannins. Alligator with marked vertical grain perfectly complements the nobility of the case, while deeply grained calf offers superior resistance to daily scratches. Vegetable-tanned leather develops golden patina over time, synchronising aesthetically with the evolution of the 18k gold. Ideal colours range from chocolate brown to deep burgundy, extending to classic black for those preferring a more conservative aesthetic.

Changing the strap on the Black Bay One 79663-0003 requires the use of a spring bar tool. Carefully insert the tip of the tool into one of the lateral pins on the case and lift gently to compress the internal spring, then remove the old strap. To install the new 20mm strap, insert the upper lug into the pin first, then, while keeping the case steady, reinsert the lower pin ensuring both ends of the strap are symmetrically aligned. The operation requires delicacy to avoid scratching the two-tone case, particularly on the gold lugs.

Yes, any strap with a 20mm lug width is compatible with the Tudor Black Bay One 79663-0003, provided the distance between the lugs does not present excessive tolerances. An artisanal-quality 20mm strap made from natural leather and hand-sewn often offers superior ergonomics and longevity compared to certain OEM straps. Verify that the new strap has thickness consistent with the watch's style: a strap that is too thick or too thin could alter the visual proportion of the case. MilanoStraps straps for this lug width are specifically calibrated for the Black Bay One.

The lifespan of a natural leather strap depends on the material, construction quality, and usage. A strap in alligator or calf leather with artisanal vegetable tanning, worn daily on a watch like the Black Bay One, has an average life of 3-5 years before requiring replacement, thanks to the natural development of patina that protects against rapid degradation. The flexing zone (where the strap flexes at the wrist) is most exposed to wear: over time it develops fine creases that are signs of noble ageing, not structural failure. An artisanal strap made from premium leather and double stitching tends to last longer than mass-market alternatives. Occasional maintenance (gentle cleaning, occasional hydration with natural creams) significantly extends useful life.