Strap for Chronographs Trier / Stainless Steel / Black

The lug width of the Laco 861915 is 20mm. This measurement indicates the distance between the inner shoulders of the two lugs on the case. You can verify the measurement by placing a ruler perpendicular to the lugs, from one shoulder to the other. Any strap intended for this model must have a width compatible with 20mm.

The ideal strap depends on your intended use. Dark brown or black alligator emphasises the pilot watch character; cognac vegetable-tanned calf leather offers versatility and a developing patina; grey or navy blue NATO straps maintain historical authenticity; an FKM rubber strap is recommended for summer or regular water use. All must be compatible with 20mm lug width.

To change the strap: position the watch on a stable surface with the dial facing downwards. Using a spring bar tool, gently push inward the retention lever of the spring on the first lug, allowing the pin to exit. Repeat on the opposite lug. Insert the pins of the new strap (20mm) into the lugs, ensuring the retention springs click correctly into place. Verify security by rotating the strap.

Yes, the Laco 861915 is fully compatible with quality aftermarket straps, provided they are 20mm lug width and made from appropriate materials. Leather straps (alligator, calf, box calf), military-grade NATO textile, and FKM rubber are all valid options. Always verify the lug width before purchase.

A quality leather strap (alligator or vegetable-tanned calf) typically lasts 3–5 years with moderate daily wear. Longevity depends on sun exposure, humidity, perspiration, and frequency of use. The leather develops a rich patina progressively. Regular maintenance—gentle cleaning with a damp cloth, occasional conditioning—significantly extends service life. After wear, the strap can be easily replaced whilst retaining the original case.