Nivada Grenchen
Super Antarctic 35013M20— lug 18mm

The lug width is 18 millimetres. This measurement refers to the internal distance between the two attachment pins of the strap. It is a precise specification and does not permit modifications: straps must be specifically constructed for 18mm lugs to ensure correct fit and longevity.

For this explorer-wear model, we recommend leather straps in vegetable tanning (beaver, cognac, honey) which accentuate the field-tool character and develop natural patina over time. Alligator is the formal alternative for elegant occasions. NATO in dark blue or charcoal grey maintains the pragmatic aesthetic of the original design.

Strap replacement requires a spring bar removal tool. Position the small hook of the tool against the spring bar pin, press inward to release the internal spring, extract the pin. Repeat on the opposite lug. Insert the new strap by aligning the holes with the pins, then reinsert the pins until a click indicates secure locking.

Yes, provided they are constructed for 18mm lugs. Aftermarket straps of artisanal quality (such as those from milanostraps.it) often offer superior material quality and finishing compared to original straps. Always verify that the width is exactly 18mm before purchase.

A quality vegetable-tanned leather strap typically lasts 2–3 years with moderate daily use. Shell cordovan, if available, can exceed 5 years. Longevity depends on usage patterns, care, and moisture exposure. Regular maintenance (leather conditioner, protection from water) significantly extends strap lifespan.