Strap for Spirit Automatic 40 Blue / Strap XL

The lug width of the Longines Spirit L3.810.4.93.3 is 21mm. This measurement is specific to this model and is measured between the inner points of the lugs on the watch case. It is essential to verify this dimension with a digital calliper before ordering an aftermarket strap.

The ideal pairing depends on your usage profile. For formal occasions, a high-grade alligator strap (Hermès or Döring) emphasises elegance without compromising the military heritage. For dynamic wear, vegetable-tanned calf leather develops natural patina over time. For professionals seeking everyday versatility, a grey NATO canvas or FKM rubber strap offers superior practicality and adaptability.

Strap replacement is performed by removing the spring bars that connect the strap to the watch lugs. Use a dedicated spring bar tool to gently lift the pin from one side, then extract the strap. Insert the new strap, aligning the holes with the pins, then press firmly until you hear the locking click. We recommend professional assistance to prevent damage to the case.

Any strap with a 21mm lug width is compatible with the L3.810.4.93.3. At milanostraps.it, you will find a curated selection of artisanal 21mm straps in various materials: alligator, Italian calf, shell cordovan, rubber, and NATO. Each strap can be customised in length, hole positioning, and thread colour to fit your specific wrist.

The lifespan of a leather strap depends on material quality and frequency of wear. A high-quality Hermès alligator strap, with regular maintenance, resists 4-5 years of daily use. Vegetable-tanned calf, being more robust, lasts 5-7 years. FKM rubber guarantees greater longevity (7-10 years) but less aesthetic versatility. Casati Milano provides an 18-month warranty on all bespoke straps.