Nivada Grenchen
Antarctic 35005M15— lug 18mm

The Nivada Grenchen Antarctic 35005M15 is fitted with an 18mm lug width. This measurement is integral to the model's proportional design, balancing the 35mm case diameter with the vertical development of the lugs. Lug width is measured by placing a digital calliper between the inner edge of one lug and the other, perpendicular to the spring bar, without applying force.

The choice depends on intended use and aesthetic context. For refined discretion, an alligator leather with vegetable tanning complements the brushed steel case material. For sporting versatility, a textured calf or canvas NATO offers robustness and adaptability. For humid or marine environments, an FKM rubber with waffle grip provides maximum functionality and decade-long durability without maintenance. The 18mm size demands precise artisanal construction: our straps are engineered to exact specifications that respect the lug profile.

To change the strap, extract the spring bars holding each lug to the case tube. Use a flat tool (a specialised strap removal tool or fine screwdriver blade) to gently push the spring bar inward, creating space to slide the lug free. Exercise caution: spring bars are small and prone to loss. Align the new strap with the lug holes and insert with a fluid motion until the spring bar snaps into position. The 18mm size demands precision: poorly constructed straps risk slack or friction against the case tube.

Yes, provided the lug width is precisely 18mm. However, construction quality is decisive. An inexpensive aftermarket strap may exhibit poor dimensional tolerances, causing excessive play or binding. Our 18mm straps are manufactured to tight tolerances, ensuring precise fitment. For leather, the shoulder rigidity must align with the lug profile to prevent anomalous creasing in the first month of wear.

Leather strap longevity depends on material, tanning method and usage pattern. Quality calf leather with vegetable tanning typically resists 2–3 years of moderate daily wear (4–5 days weekly). Alligator leather, due to structural density, withstands 4–5 years under identical conditions. Humidity, heat and direct sunlight accelerate degradation. Canvas NATO and FKM rubber straps maintain functionality for 7–10 years without significant decay. Periodic maintenance—light brushing for leather, neutral soap cleaning—extends lifespan considerably.