Strap for Evidenza 33.1 Full Calendar

The lug width (ansa width) of the Longines Evidenza L2.671.4.78.9 is precisely 18 mm. This measurement refers to the internal distance between the two lugs where the strap is fitted. You can verify this dimension by carefully measuring the inner space between the metal pins of the case using a vernier calliper. This specific dimension is critical when selecting a compatible strap, whether original Longines or aftermarket.

The ideal strap depends on your intended use. For formal and office settings, we recommend a dark brown alligator strap with fine grain, which respects the classical elegance of the Evidenza. For a versatile and long-lasting choice, Italian vegetable-tanned calf leather provides natural aging and patina development. For summer wear, a cotton NATO strap offers comfort and simplicity. Every choice must respect the standard length of 120-150 mm and coordinate chromatically with the dial.

Strap replacement is performed by extracting the lug pins. Position your watch on a soft surface (microfibre cloth) and use a spring bar tool, available at specialised watch retailers. Gently push from one side to the other to remove the pin from the first lug, then from the old strap, and finally insert it into the new strap. Ensure the pin is perfectly aligned and firmly seated before repeating the procedure on the opposite side.

Yes, absolutely. A quality aftermarket strap, provided it respects the 18 mm lug width, is perfectly compatible with the L2.671.4.78.9. Custom straps in fine leather, canvas or rubber represent an excellent alternative at lower costs whilst maintaining high construction standards. Ensure the strap is built with durable materials and quality finishing, thereby honouring the architecture of the stainless steel case.

The lifespan of a leather strap depends on frequency of use, quality of tanning, and environmental conditions. A high-quality alligator or calf strap, worn daily, maintains structural and aesthetic integrity for approximately 3-5 years. Vegetable-tanned leather tends to age more visibly than chrome-tanned leather, developing a natural patina that many collectors appreciate. Prolonged exposure to moisture, direct sunlight, and perspiration accelerates wear. Regular maintenance (gentle cleaning and application of specific balms) can significantly extend the strap's useful life.