Nivada Grenchen
Super Antarctic 32031A15— lug 20mm

The lug width of the Nivada Grenchen Super Antarctic 32031A15 is precisely 20.00mm. This measurement is standard for timepieces of 38mm case diameter in this construction category. To verify aftermarket strap compatibility, measure the net distance between the two lugs using a digital calliper, ensuring you achieve tolerance to the tenth of a millimetre.

For the Super Antarctic, robust and durable materials are recommended: an alligator strap with vegetable tanning offers visual presence and resistance to extreme conditions; a shell cordovan strap guarantees superior aesthetic ageing; a vegetable-tanned calf strap maintains the sober construction philosophy. Alternatively, a heavy-weight cotton NATO or a breathable rubber NATO are ideal for summer wear.

The strap change procedure requires the use of a spring bar tool – a specific instrument fitted with a metal lever. Position the watch with the case facing upwards, insert the spring bar tool lever into the gap beneath the lug, push downward to compress the internal spring tension until release, then gently extract the lug. Repeat symmetrically on the opposite lug. Insert the new strap following the reverse procedure, ensuring the lugs are correctly positioned and the spring returns to its natural seat.

An aftermarket strap with 20mm lug width is fully compatible with the 32031A15. We always verify that the net width of the attachment seat is exactly 20.00mm, as even minor variations – 0.5mm – create unacceptable mechanical play. The straps available on milanostraps.it in the 20mm category have been tested for compatibility and construction quality with this Nivada model.

A high-quality leather strap – alligator, shell cordovan, or vegetable-tanned calf – provides an average lifespan of 3-5 years with daily wear, provided periodic maintenance is performed. Exposure to humidity, perspiration, and extreme temperature fluctuations naturally accelerates fibre ageing. We recommend rotating different straps if the watch is worn daily, allowing the leather to breathe and acquire a uniform patina over time. Atelier Casati Milano offers strap replacement and restoration service with sartorial craftsmanship.