Strap for Evidenza 33.1 Full Calendar

The lug width is 18 mm. This non-standard measurement requires careful sourcing from specialist suppliers, as the mainstream market does not adequately cover it. Measuring the lug with a digital calliper between the inner attachment points is the most accurate method.

Alligator with vegetable tanning in cognac or dark brown is the top choice, enhancing formal elegance and case geometry. Vegetable-tanned calf leather represents the most robust everyday alternative; shell cordovan offers superior resistance. Sports contexts remain valid options for NATO canvas or vulcanised rubber in neutral colours.

Replacement requires two tools: a spring bar tool and a light source. Place the watch on a stable surface, locate the central lug on the case, insert the tool to compress the spring and extract the old strap. Repeat on the other side. Insert the new strap by aligning the ends with the attachment holes, compressing until the security click. For valuable watches, delegating to a watchmaker is advisable.

No, the 18 mm lug width is specific to a few Longines and competitor models. It is not interchangeable with 16 or 20 mm straps. Before purchasing aftermarket, always verify your watch reference with the supplier to exclude measurement errors.

A quality artisanal alligator or calf strap typically lasts 3-5 years with daily wear, developing a fascinating patina over time. Longevity depends on mechanical wear (buckle opening), moisture exposure and perspiration. Vegetable-tanned leathers age better than plating. Periodic maintenance (buckle lubrication, drying after moisture) significantly extends useful life.