Nivada Grenchen
Antarctic 35002M17— lug 18mm

The lug width is 18 millimetres. This measurement should be verified with a digital or analogue calliper, positioned between the hole axes of the lug. It is an intermediate standard that requires careful sourcing of compatible straps, as it is not widely available in standard catalogues.

It depends on intended use and aesthetic preference. Dark brown alligator emphasises the scientific and vintage character. Vegetable-tanned leather develops natural patina over time, enhancing the watch's historical value. Canvas NATO in grey-green evokes the original polar heritage. Natural rubber is the most functional and durable choice.

Use a spring bar removal tool. Insert the tip into the gap between the lug and strap, pushing downward to release the pin from its slot. Repeat on the opposite side. Remove the old strap and insert the new one, ensuring the spring bars engage correctly with the lugs. If unfamiliar with the process, consult a qualified watchmaker.

Yes, provided the lug width is 18 millimetres. Verify that the strap channel is slightly wider than the case lug (typical tolerance is 0.5–1 millimetre). Bespoke aftermarket straps often offer superior construction quality and materials compared to original vintage straps.

Duration depends on usage, climate and maintenance. A high-quality alligator or leather strap worn daily lasts 3–5 years. Humidity, perspiration and direct sunlight exposure accelerate wear. Vegetable-tanned leather develops patina (desirable), though structural integrity gradually diminishes. Regular gentle cleaning and conditioning extends lifespan significantly.