Nivada Grenchen · Super Antarctic

Strap for Super Antarctic 35 Black - Beige Luminova / Stainless Steel / Flat Link

Takes 18 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width18 mm
Case diameter35 mm
Reference35013M20
FamilySuper Antarctic
MovementLanderon caliber 21 Hours, Minutes, Seconds
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the Super Antarctic 35013M20

Selected for the 18 mm lug width · workshop selection

All 18 mm straps →

The Super Antarctic 35013M20, seen from the bench

The Nivada Grenchen Super Antarctic features the Landeron 21 caliber with hours, minutes and seconds indication. The watch has 18mm lugs and represents the Swiss manufacturer's proposal for a sporty timepiece. The reference 35013M20 uses a traditional mechanical movement for basic functions.

Frequently asked questions

What is the lug width of the Nivada Grenchen Super Antarctic 35013M20?

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.

Which strap pairs best with the Nivada Grenchen Super Antarctic?

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.

How do I change the strap on this watch?

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.

Are aftermarket straps compatible with the 35013M20?

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.

How long does a leather strap last on this watch?

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.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only