Strap for Antarctic 35 Eggshell - Beige Luminova / Stainless Steel / Black Racing

The lug width of the Nivada Grenchen Antarctic 35001M40 is 18 mm. This width is standard for Swiss watches from the 1950s and 1960s of this proportion (35 mm case diameter) and represents the optimal ratio between the case and the strap. Any strap purchased must be compatible with this specific dimension: verify that the distance between the contact points of the case lugs is exactly 18 mm before purchase.

The ideal strap depends on intended use. For a formal or elegant approach, a strap in alligator leather with natural grain or in calf leather from vegetable tanning is the most sophisticated choice. For vintage-authentic daily wear, a NATO strap in robust canvas (military green or navy blue) reflects the Swiss heritage of the watch. For summer weather or those preferring practicality, a vulcanised rubber strap in dark grey or blue is a contemporary and durable solution.

The Antarctic strap is changed by removing the spring bars that attach the strap to the case lugs. You'll use a dedicated tool (spring bar tool) inserting it into the side hole of the spring bar to compress the internal spring and release the strap from the lug. Insert the new strap aligning the holes with the lugs and allow the spring bars to return to position. This is a straightforward operation you can perform at home or at a watchmaker's.

Yes, any strap with an 18 mm lug width is compatible with the Antarctic 35001M40, provided the spring bars are the same width. Artisanal leather straps, NATO fabric straps and rubber straps are all valid options. The important thing is to verify that the width is exact and that the strap is correctly sized in length for your wrist.

A quality leather strap (alligator or vegetable-tanned calf) has an average lifespan of 3–5 years with regular use and proper maintenance. Longevity depends on the type of tanning, frequency of use and exposure to moisture and perspiration. A vegetable-tanned calf strap develops a more interesting patina over time and ages better. Vulcanised rubber lasts 4–6 years. Canvas NATO is virtually indestructible and can last for decades.