Strap for Spirit Automatic 42 Black / Bracelet

The lug width of the Longines Spirit L3.811.4.53.6 is 22mm. This measurement is fixed and determined by the case geometry and integrated lugs. Measure the distance between the two lugs protruding beneath the case terminals to verify compatibility with any replacement strap.

Your choice depends on intended use and personal style. To emphasise the aviatory-instrumental character, we recommend dark brown or black alligator with a satin steel deployante. Vegetable-tanned calf leather is perfect if you desire a natural patina that evolves over time. For practicality and nomadic versatility, select a NATO strap in military grey or sky blue tones.

Use a dedicated spring bar tool: a ballpoint pen-style remover or a specific cross-shaped watchmaker's tool. Position the watch with the lug facing upward, insert the tool into the small lateral hole adjacent to the lug pin and gently press the internal piston. The lug will retract and you can extract the strap. Insert the new strap, align the holes and push the lug until it clicks securely into place.

Yes, any strap with a 22mm lug width is compatible. Always verify that the width is precisely 22mm and that the spring bar diameter matches (typically 1.5mm for this watch category). Milano Straps personalised straps guarantee construction precision and total compatibility with the L3.811.4.53.6.

Durability depends on leather quality, daily use and maintenance. A strap in premium alligator or vegetable-tanned calf typically lasts 5–8 years of regular wear, often longer with proper care: periodic cleaning, conditioning with natural waxes and rotation with alternative straps. Casati Milano straps include an 18-month guarantee and are crafted with traditional tannage for extended longevity.