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

The Tudor Black Bay One 79673-0004 features a 20mm lug width, representing the distance between the two fixed spring bar supports on the case. Accurate measurement requires a digital calliper or precision ruler, measuring from lug to lug rather than the thickness of the strap itself.

We recommend alligator leather with vegetable tanning in brown or black tones, as the patina naturally complements the bimetallic case character. Shell cordovan represents a minimalist choice offering deep patina and exceptional longevity (15-20 years). Satinised vegetable-tanned calf in honey brown provides warm harmony. NATO and rubber are best avoided unless pursuing a purely sport aesthetic.

Remove the current strap by gently depressing the ends of the spring bars with a dedicated tool until the retention balls release. Once the bars are extracted, place them on the new strap, aligning the passage holes. Reinsert the strap into the case with firm pressure until the spring bar balls lock into position. Verify the security by attempting to move the strap laterally.

Yes, any strap with a 20mm lug width is compatible with the 79673-0004, provided the strap body thickness remains appropriate (typically 3-4mm). We recommend verifying the internal diameter of the keeper loop to avoid excessive friction with the spring bars. Custom straps from Casati Milano offer complete personalisation of thickness and dimensions.

An alligator or vegetable-tanned calf strap typically lasts 5-8 years with daily wear and regular maintenance (monthly cleaning, biannual conditioning). Shell cordovan extends this lifespan to 15-20 years due to its dense fibrous structure. Wear accelerates with frequent perspiration, excessive humidity, and temperature fluctuations. Casati Milano provides an 18-month warranty with leather regeneration options.