Strap for DS Chronograph Automatic 1968 PVD / Black

The lug width of this Certina model is 21 mm. This measurement is calculated between the two lug terminals of the case and is the essential technical specification for selecting a compatible aftermarket strap. The 21 mm width represents the aesthetic equilibrium between the case diameter (42.50 mm) and the tonneau-style proportions of the case design.

The ideal strap depends on personal use and style preference. For understated elegance: dark brown alligator or shell cordovan. For everyday sophistication: vegetable-tanned leather calf in natural, cognac, or tobacco tones. To honour the original tool watch character: heavy cotton NATO or Cordura. For practicality: water-resistant rubber. All materials must respect the 21 mm lug width specification.

Strap replacement requires minimal tools: a spring bar tool or small screwdriver. Locate the replacement lug on the two case terminals (where the old strap is attached), align the lug with the case slots, and insert the spring bar along the retaining pin until you hear a click to lock. If using a deployante buckle, ensure it is in the closed position before installation.

All straps with a 21 mm lug width are compatible with this reference. Options include premium leathers (alligator, shell cordovan, vegetable-tanned calf), specialist fabrics (NATO, Cordura), vulcanised rubber, and synthetic derivatives. Always verify the declared lug width before purchase: 21 mm is the non-negotiable specification for installation without case modification.

Durability varies according to tannage method, usage patterns, and environment. A vegetable-tanned calf strap lasts 3–5 years in moderate daily use whilst ageing with elegant patina. Shell cordovan resists 8–12 years. Alligator (less water-exposed) offers 4–7 years. Fabric straps endure 5–8 years before wear becomes significant. Vulcanised rubber withstands 10+ years if cleaned regularly. Continuous exposure to salt water reduces these intervals by 30–40%.