Strap for Spirit Zulu Time 1925 39 Stainless Steel - Pink Gold / Black / Bracelet / 100 Years

The lug width (ansa misure) of the Longines Spirit L3.803.5.53.6 is 21 mm. This dimension is specific to this model and must be measured from the centre of the internal spring bar. A strap with a different lug width will not fit correctly to the case, causing unwanted play or friction.

Natural alligator or vegetable-tanned calf leather are the ideal choices. For a formal aesthetic, select dark brown or graphite black alligator; for daily wear, calf leather develops a patina that ages parallel to the rose gold case, creating visual harmony over time. Avoid NATO or sports straps, which would compromise the classical identity of the Spirit.

To change the strap, you must remove the spring bars positioned at the ends of the case. Use a dedicated tool (spring bar tool) to compress the internal spring and extract the bar from the lug hole. Insert the bar into the new strap whilst maintaining compression, then position it in the case. Verify that the bar is fully inserted before releasing pressure.

Any strap with a 21 mm lug width is compatible. Online retailers offer straps in alligator, calf, crocodile and rubber with this specific measurement, available both standard and customisable in length, initials and stitch type. It is essential to verify that the strap has been measured correctly according to industry standards.

A quality leather strap (alligator or natural calf) has an average lifespan of 3–5 years with regular daily wear. Longevity depends on factors such as ambient humidity, frequency of wear, maintenance and type of tanning. Vegetable-tanned straps develop character and patina as they age; alligator straps retain lustre longer. Periodic maintenance with neutral balm or natural wax extends useful life significantly.