Strap for KonTiki Quartz Chronograph Khaki

The Eterna Adventure 1250.41.50.1360 features a lug width of 20mm. This measurement, taken between the two spring bars that connect the strap to the case, is a construction standard specific to the 42mm models in this family. Any compatible strap must have an exact width of 20mm to ensure smooth insertion and visual harmony with the case proportions.

The choice depends on your intended use. For refined elegance, an alligator strap with vegetable tanning in cognac or black, or a vegetable-tanned calf leather with stainless steel deployante. For sportive practicality and water resistance, a NATO strap in military-grade nylon or a high-grade FKM rubber. The Adventure demands materials that reflect its instrumental character: we recommend straps with 1.4–1.6mm thickness for leather, fine texture and absence of evident plasticisers.

The strap is replaced by removing the two spring bars (elastic pins) that connect the strap to the case. Using a dedicated tool (spring bar tool) or small screwdriver, compress the pin on one side and extract it gently from the lug. Once the lug is empty, insert the new strap, aligning it perfectly, and reinsert the pin, ensuring it clicks securely on both sides. This procedure takes only a few minutes and requires no watchmaking expertise.

All straps with a 20mm lug width are compatible. Milano Straps offers a specialised selection of leather, NATO and rubber in this size, crafted to qualitative standards that do not compromise the aesthetic or functional integrity of the watch. Each strap is tested to ensure smooth insertion into the case lugs and proportions suited to the 42mm diameter.

A high-quality leather strap (alligator, vegetable-tanned calf) typically lasts 3–5 years with daily wear, developing an authentically vintage patina over time. Longevity depends on perspiration, sun exposure and maintenance. To extend lifespan: avoid prolonged water immersion, dry promptly if wetted, apply neutral balms (alcohol-free) every 2–3 months. An FKM rubber, if properly stored, retains elasticity for 5–7 years before stiffening. Leather is a living material and ages nobly, enriching the watch.