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

The lug width of the Tudor Black Bay One 79663-0007 is exactly 20mm. This measurement is taken from the centre of one lug to the centre of the other lug, on the underside of the case. It is a standard size for both vintage and contemporary Tudor models, allowing compatibility with a vast range of artisanal leather and fabric straps.

The optimal choice depends on your intended usage. For formal wear with longevity, a matte black alligator or vegetable-tanned calf leather in dark brown tones harmonises beautifully with the two-tone case. For daily casual use, a cotton NATO or quality synthetic rubber strap maintains the correct 20mm proportions whilst offering practicality. Always select a strap with a stainless steel or titanium deployant clasp to preserve aesthetic coherence.

Strap replacement on the 79663-0007 involves removing the spring bars that connect the strap to the case lugs using a spring bar tool. This tool compresses the internal springs, allowing the bars to slide out smoothly. Once removed, the old strap comes free. Installation of your new 20mm strap follows the reverse procedure, ensuring the spring bars lock fully into place. If inexperienced, professional fitting through a qualified watchmaker or Casati Milano atelier is recommended.

Yes, any 20mm lug width strap is mechanically compatible with the 79663-0007, provided the spring bars are standard specification and the strap is constructed to proper horological tolerances. Artisanal straps from specialised manufacturers guarantee build quality, precise 20mm lug width dimensions, and durable materials (alligator, calf, shell cordovan, fine textiles). Avoid generic products or straps with dimensions significantly different from 20mm.

Lifespan depends on material and wear patterns. Alligator or vegetable-tanned calf leather typically lasts 5–8 years of daily use, developing desirable patina over time. Shell cordovan, with proper maintenance (occasional soft cloth cleaning and conditioning), can exceed 10 years. Cotton NATO straps have a practical life of 3–4 years. All quality artisanal straps are replaceable without affecting the watch itself, allowing periodic aesthetic renewal. Casati Milano offers an 18-month warranty on all bespoke straps produced in their atelier.