Strap for Elegant Collection Automatic 39 Stainless Steel / White / Strap

The lug width of the Longines Elegant L4.910.4.12.2 is 20 millimetres. This measurement refers to the distance between the attachment pins at the lugs of the case. To verify, measure the interior of the case between the two lugs with a digital calliper: the result must be exactly 20 mm (tolerance ±0.5 mm).

Given the dress-watch vocation of this timepiece, the ideal strap is alligator leather in dark tones (black, dark brown, burgundy) or smooth calf leather with vegetable tanning in natural colour. Both maintain the formal elegance of the case. For summer configurations, cotton nato in stone grey offers modernity without aesthetic compromise.

Remove the watch from your wrist and, using a spring bar tool (specialist tool), gently press the internal spring of the strap attachment pins. The pins will come out of the case. Insert the pins of the new strap into the same holes and release the spring: the strap will click into place. This procedure requires patience; many owners entrust the operation to a professional watchmaker.

Yes, it is possible to use any 20 millimetre lug width strap, provided the pins are compatible (typically 1.6–1.8 mm diameter). However, we recommend choosing straps of quality construction appropriate to the watch's value. Materials such as alligator, shell cordovan or calf leather with visible stitching ensure durability and patina over time.

A quality leather strap (alligator, vegetable-tanned calf or shell cordovan) has an average lifespan of 3–5 years with daily wear, with variability depending on climate, humidity and frequency of wear. The stainless steel case lug does not wear; the strap can be replaced without any risk to the watch. The patina that develops is part of the beauty of natural material.