Nivada Grenchen
Super Antarctic 35013M01— lug 18mm

The Nivada Grenchen Super Antarctic 35013M01 features an 18mm lug width. This measurement represents the distance between the two lug holes and is a historic standard for high-quality Swiss watches. When selecting a replacement strap, ensure the spring bars are sized for 18mm compatibility.

The most suitable straps for this model are dark brown or black alligator leather, shell cordovan, vegetable-tanned calf, khaki polyester NATO, and black FKM rubber with integrated deployante. The choice depends on context: alligator for formal elegance, NATO for sporting authenticity, and rubber for pure technical applications.

The strap is replaced by removing the spring bars that secure the old strap to both sides of the case. Use a dedicated strap removal tool or a small flathead screwdriver to gently push the spring bar from the opposite side. Align the new strap's holes with the bars and push the bar until fully seated. Verify secure attachment before wearing.

Yes, a quality aftermarket strap is fully compatible with the Super Antarctic 35013M01, provided the lug width is precisely 18mm. Milano Straps offers a curated selection of artisanal straps in various materials and finishes, specifically sized for this measurement, that respect the character and era of the case.

Leather strap longevity depends on material quality, tanning method (vegetable-tanned lasts longer than chrome-tanned), daily wear, and environmental humidity. A well-crafted alligator or shell cordovan may last 3-5 years of regular wear, whilst vegetable-tanned calf is typically estimated at 2-3 years. Maintenance, such as preventing water pooling on the spring bars, significantly extends useful life.