Strap for Black Bay 31 Stainless Steel / Black - Diamond / Bracelet

The Tudor Black Bay One 79600-0004 features a lug width of 17mm. This measurement is exceptionally rare in contemporary watchmaking and must be verified before purchasing any aftermarket strap. The distance between the two holes where the spring bars attach is precisely 17mm, measurable by removing the current strap or inspecting the internal metal pins. Not all straps designed for small-cased watches (31mm) feature this exact lug width—compatibility verification is essential before purchase.

For the Black Bay One 79600-0004, we recommend a matte black alligator or dark brown strap, which does not compete with the midnight blue dial and develops organic patina over time. Alternatively, light cognac Tuscan calf amplifies warmth without visually overwhelming the compact case. For sporty applications, a dark blue jacquard NATO with central stripe offers versatility and quick changes. Avoid pure red shell cordovan, which is too dark for this 31mm; consider only if your aesthetic deliberately favours dramatic contrast.

Remove the watch from your wrist. Use a spring bar tool (small implement with two curved prongs) to compress the internal springs of the lugs. Insert the prong into one of the side holes of the lug, press downward until the spring retracts, then gently pull the strap outward. Repeat on the opposite side. To install the new 17mm strap, align the holes of the new strap with the lugs, retract the spring using the tool, and insert it into the hole. Allow the spring to snap into position. Verify the strap is secure before wearing the watch. If uncertain, consult a professional watchmaker.

Yes, the Tudor Black Bay One 79600-0004 accepts aftermarket straps provided they feature a 17mm lug width. Quality straps—whether artisanal alligator, Italian calf, or shell cordovan—are entirely compatible. Ensure the seller explicitly specifies the 17mm lug width before purchase. Avoid generic "small watch straps" without technical specification of width: they may not fit the lugs of your Black Bay One correctly. The Casati Milano atelier also creates bespoke custom straps for this specific model.

A naturally tanned leather strap (alligator, calf, cordovan) typically lasts 3–5 years with moderate daily wear. If you wear the Black Bay One 79600-0004 daily, the strap degrades more rapidly at the flex point near the lugs. Perspiration, sun exposure, and water contact reduce longevity. NATO and rubber straps endure 5–8 years since synthetic elastomers and textiles resist moisture better. To maximise lifespan, rotate straps, avoid saltwater, and apply conditioning oil every six months. Artisanal straps from Casati Milano include an 18-month warranty against manufacturing defects.