Strap for Elegant Collection 25.5 Automatic Stainless Steel / Grey / Bracelet

The lug width of the Longines Elegant L4.309.4.78.6 is precisely 13mm. This measurement corresponds to the internal distance between the two spring bars that anchor the strap to the case. It is a rare dimension in the feminine watch strap market, therefore it is essential to verify compatibility before purchasing an aftermarket strap.

For the L4.309.4.78.6, an alligator strap in vegetable tanning in black or dark brown is recommended, which emphasises the minimalist Swiss aesthetic. Shell cordovan in cherry is an excellent choice for those seeking chromatic depth and patina that evolves over time. Evercalf calf leather in neutral tones (off-white, beige) offers a compromise between tactile comfort and aesthetic coherence.

Strap replacement requires the use of a spring bar tool—a dedicated instrument for compressing spring bars. Position the watch with the lug facing upwards, insert the tool into the small recess of the spring, press gently to release it, then extract the lug from the hole. Repeat on the opposite side. Insert the new strap aligning it perfectly, then release the spring. Avoid excessive force: the mechanism is delicate and incorrect pressure could damage the case.

No. The 13mm lug width is specific to small-diameter feminine models. Watches with 14mm, 16mm or 18mm lugs are not compatible. Lug width determines the distance between the spring bars and varies according to case design. A 13mm strap will not fit correctly into a wider lug.

A quality leather strap (alligator, calf, shell cordovan) has an average lifespan of 3-5 years with daily use, extendable to 5-7 years with regular maintenance and rotation with other straps. Factors such as sun exposure, humidity, perspiration and frequency of use influence longevity. Vegetable tanning tends to age more elegantly than chrome tanning, developing a patina.