Strap for Klassik Chronograph Stainless Steel / Black / Leather

The Archimede Klassik UA7939-C2.31 features a lug width of 18mm. This dimension is standard for this model and must be observed precisely to ensure proper strap fitting. To verify compatibility, measure the internal distance between the two lugs at their widest point: the value must be exactly 18mm.

For the Klassik UA7939-C2.31, we recommend straps in alligator leather with fine grain (belly cut) or shell cordovan for formal wear. These materials maintain aesthetic coherence with the case's design discipline. For sport-elegant use, vegetable-tanned calf leather offers practical versatility. For aquatic environments or intensive use, FKM rubber is the most suitable solution.

To change the strap, position the watch on a flat surface. Use a spring bar removal tool or a thin screwdriver to gently push the elastic pins at the strap ends, releasing the internal spring. Remove the old strap, then insert the new one, ensuring the lugs fit correctly into the case's lug slots. Verify that the new strap is perfectly centred before fastening.

Yes, the Klassik UA7939-C2.31 is fully compatible with certified aftermarket straps specified for 18mm lug width. We recommend verifying that the strap is manufactured to high quality standards to avoid compromising the case's solid construction. Specialist strap manufacturers guarantee dimensional accuracy and finishes coherent with the watch's design language.

A premium quality leather strap (alligator, shell cordovan, or vegetable-tanned calf) on a wristwatch with moderate daily use typically lasts 5–7 years. Deterioration depends on exposure to moisture, direct sunlight, and perspiration. Regular maintenance (conditioning with specialist creams, drying after wetting) significantly extends durability. Nylon NATO straps in high-density fabric have greater longevity, up to 10+ years with proper care.