Strap for Spirit 40.5

The lug width of the Longines Spirit L2.700.4.53.6 is precisely 20mm. This measurement is taken between the spring bar attachments on the case lugs and is essential for purchasing compatible straps. On a 40.50mm case diameter, the 20mm lug width ensures optimal proportions without excessive overhang on the wrist.

The ideal strap depends on intended use. For formal wear, fine-grain alligator is the refined choice; for daily wear with character, burgundy or cognac shell cordovan develops natural patina; for versatility, vegetable-tanned calf leather ages nobly. Given its avionic heritage, the Spirit particularly suits structured leather in earth tones or NATO straps in military green.

The strap is replaced using a spring bar tool (small lever). Press gently on one side to release the pin, remove the old strap, then insert the new strap by sliding the pin into the lug attachments. Work carefully to avoid scratching the case. If you lack experience, Casati Milano's atelier offers strap changes with personalized styling consultation by appointment.

Yes, provided the lug width is exactly 20mm. Aftermarket straps in leather, rubber or fabric offer complete mechanical compatibility. However, construction quality, leather selection and stitching refinement transform the tactile experience and longevity: a Milan-made artisanal strap develops character over time, whilst generic alternatives wear more rapidly.

A quality vegetable-tanned leather strap lasts approximately 5-8 years with daily wear, depending on exposure to moisture, perspiration and UV rays. Shell cordovan can extend to 10 years if properly maintained. Natural leather is not waterproof: protect it from heavy rain and wash your hands before wearing the watch during summer. Casati Milano guarantees their straps for 18 months, covering manufacturing defects and offering ongoing support.