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

The lug width of the Tudor Black Bay One 79673-0003 is 20 mm. This measurement is critical for aftermarket strap compatibility: we recommend verifying it with a digital calliper before purchase, as even minor tolerances can cause excessive play or mounting difficulties.

Given the two-tone case (yellow gold and stainless steel) and sporting heritage, we suggest vintage alligator in dark brown or black for sustained elegance, or vegetable-tanned calf for those seeking a patina that evolves with wear. For a more dynamic interpretation, a woven NATO or robust elastomer maintains the original Black Bay philosophy.

Use a spring bar tool to gently lift the spherical pins at the lug extremities. Rest the watch on a soft surface, insert the bifurcated tip of the tool beneath the pin, apply light upward pressure until the pin retracts. Repeat on the opposite lug. Position the new strap by aligning it to the holes, reinsert the pins. Reversible operation in approximately 2 minutes.

Yes, provided it is constructed to 20 mm specification. Verify width with a calliper before purchase. Quality industrial straps generally adhere to ±0.1 mm tolerance. Avoid straps labelled as 'universal' without explicit width specification: the risk of incompatibility is substantial.

A quality leather strap (alligator, vegetable-tanned calf, shell cordovan) typically lasts 3–5 years with daily wear, up to 7–10 years with occasional use. Wear accelerates in humid environments or with saline contact. Regular maintenance with neutral cleanser and conditioning every 12 months significantly extends longevity. Casati Milano straps include an 18-month warranty against manufacturing defects.