Strap for Flagship 30 Stainless Steel / White / Bracelet

The lug width of the L4.374.4.18.6 is 15mm, a non-standard dimension requiring bespoke strap production. Correct measurement is performed with a digital calliper, measuring the internal distance between the two lug pins on the watch case.

For the L4.374.4.18.6 we recommend grey-taupe alligator, vegetable-tanned calf in cognac or burgundy tones, or suede leather. Choice depends on usage: alligator for formal occasions, vegetable-tanned calf for daily wear with evolving patina, FKM rubber for summer. Milano Straps produces all options tailored to 15mm width.

Remove the original straps by operating the lug pins with a suitable tool (pin remover). Slide each pin outward until fully detached. Insert the pins into the new 15mm-width strap, ensuring they sit firmly without play. For bespoke straps, verify compatibility with passants and deployante buckle.

Yes, provided the lug width is exactly 15mm. Non-certified Longines straps remain compatible if manufactured to the 15mm standard. Milano Straps guarantees total compatibility on customised straps and provides 18 months warranty on materials and craftsmanship.

Durability depends on material and usage: suede leather 2-3 years with regular wear, alligator 4-6 years, vegetable-tanned calf 3-5 years. Factors such as humidity, perspiration, and sun exposure accelerate ageing. Milano Straps recommends replacement when the deployante buckle no longer secures properly or the material thins excessively.