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

The lug width of the Tudor Black Bay One 79663-0004 is 20 millimetres. This measurement is taken internally between the centres of the two lugs positioned at 12 and 6 o'clock. Precise measurement using a digital calliper is essential, as any error would prevent the strap from fitting. A <a href="/pages/termine-glossario/misura-ansa">lug width</a> of 20mm is typical for sport-elegant chronographs and accommodates robust straps without visual imbalance.

For the Tudor Black Bay One 79663-0004 in two-tone (yellow gold and stainless steel), the ideal strap is <a href="/pages/termine-glossario/alligatore">alligator</a> in cognac brown or deep burgundy. Alligator creates a tactile continuum from wrist to case without competing with the gold, and its characteristic scale pattern proves robust for both sporty and formal contexts. Alternative options include vegetable-tanned vitello in deep black or Tuscan brown, which develop a patina over time coherent with the natural ageing of the gold.

Strap replacement requires a specific tool: a spring bar tool. Insert the flat tip of the tool into the spring bar aperture—the small elastic pin holding the strap—pushing downward to compress the spring, then extract the pin. Repeat on the second lug. When installing the new strap, ensure the spring bar is fully seated in the lug grooves, hearing an audible click for security. Avoid sharp tools that might scratch the case; professionals at Casati Milano can manage the changeover during a consultation.

The Tudor Black Bay One 79663-0004 accepts all straps with 20mm lug width. Online you will find <a href="https://milanostraps.it/collections/cinturini-orologi-per-misura-ansa-20mm">20mm straps</a> ready for dispatch, customisable in length, colour, initials and stitching thread. Compatibility is guaranteed by standardised lug width; however, we recommend selecting watch-grade leathers—alligator, vegetable-tanned vitello, shell cordovan—for durability and aesthetic coherence with the case's two-tone finish. Models with stainless steel <a href="/pages/termine-glossario/deployante">deployantes</a> ensure ease of adjustment without permanent modifications.

Leather strap lifespan depends on material quality and frequency of wear. A watch-grade alligator or shell cordovan, using <a href="/pages/termine-glossario/concia-vegetale">vegetable tanning</a>, ensures a service life of 5–8 years with moderate daily use, developing a patina that enhances narrative value over time. Vegetable-tanned vitello, being more porous, typically requires replacement after 3–5 years in humid climates. The Casati Milano atelier provides an 18-month warranty on custom-made straps and allows stitching repair or replacement to extend longevity. Occasional maintenance with watch-specific leather balms preserves elasticity and slows premature ageing.