Swatch
Sistem 51 SUTW400— lug 16mm

The Swatch Sistem 51 SUTW400 features a lug width of 16 millimetres. This width is standard across the Sistem51 sports family and is readily compatible with a wide range of aftermarket straps in leather, NATO, and rubber.

The choice depends on your intended use: for a classic-elegant aesthetic, we recommend a vegetable-tanned leather strap in cognac brown; for a minimalist contemporary look, black or slate grey; for intensive sports use, a rubber strap with anti-slip texture. Calf leather offers the ideal balance between elegance and daily robustness.

Strap replacement is performed via the spring bars on the case lugs. Equip yourself with a dedicated spring bar tool, gently disengage both spring bars by pressing downwards, extract the original strap, and insert the new one, ensuring the spring bars click into the anchor holes of the new strap. Seeking assistance from a specialist atelier is always advised if unfamiliar with the procedure.

Yes, provided the strap features a 16-millimetre lug width. Any 16mm strap crafted by specialised artisans (leather, NATO, rubber) is entirely compatible with the SUTW400's spring bar attachments. We always recommend verifying the technical specifications with the manufacturer prior to purchase.

Durability depends on frequency of use and material quality. A premium-quality leather strap (calf leather, vegetable-tanned) typically lasts 2–4 years under moderate daily wear. Continuous exposure to humidity, direct sunlight, and perspiration can reduce longevity. Regular maintenance (cleaning, drying, conditioning) significantly extends the strap's lifespan.