Strap for Spirit Chronograph 42 Silver / Strap XL

The lug width of the Longines Spirit L3.820.4.73.4 is 22 millimetres. This measurement represents the internal distance between the case lugs and determines strap compatibility. To verify it precisely, use a digital calliper, measuring the space between the lugs at the upper or lower part of the case.

Given the technical and avionic vocation of the model, we recommend a strap in alligator with vegetable tanning in cognac brown tones, which emphasises the historical patina of the line, or a premium NATO in military green or navy blue, directly referencing the aeronautical heritage. A smooth full-grain leather strap in deep black represents the most versatile choice for professional contexts.

Changing the strap requires a specific tool called a spring bar tool, which compresses the elastic lugs (spring bars) that hold the strap to the case lugs. Insert the tool into the lateral slot of the spring bar, compress slightly and slide the old strap out of the lug. Repeat for the lower lug, then position the new strap by reversing the procedure. If you do not have the tool, a jeweller or strap replacement service can perform the operation in minutes.

Yes, absolutely. Any strap designed for 22mm lugs is compatible with the Longines Spirit. Milano Straps offers a selection of leather, NATO and rubber straps manufactured to high quality standards and customisable to your requirements. Before purchase, always verify that the strap is marked as compatible with 22mm lugs.

The lifespan of a leather strap depends on the material, environmental wear and frequency of use. A high-quality alligator or calf strap with vegetable tanning maintains its aesthetic and functional characteristics for 3-5 years of moderate daily use. Prolonged exposure to moisture, direct sunlight and perspiration accelerates ageing. Milano Straps straps are covered by an 18-month warranty, whilst the Casati Milano atelier offers personalised advice on the maintenance and regeneration of leather over time.