Strap for Conquest Quartz 36 Stainless Steel - Diamond / MOP

The Longines Conquest L3.401.0.87.6 features 17-millimetre lugs. This measurement is taken between the internal pins of the case. To verify the lug width, use a digital calliper positioned on the pins: the distance between them is the definitive value. A 17mm lug will not accommodate 18mm straps (they penetrate poorly) nor 16mm straps (they do not fit at all).

For the L3.401.0.87.6, the ideal strap is African alligator (fine grain, natural brown-cognac tones) paired with hand-stitched natural thread. If you prefer softness and visible ageing, shell cordovan is excellent. For sports or water use, vulcanised natural rubber offers practicality whilst maintaining elegance. Select the material according to your intended daily use and desired patina development.

The L3.401.0.87.6 strap is changed by removing the spring bars using a dedicated tool: push the pin from one side until it flexes, then extract the old strap. Insert the pins into the new strap, ensuring that the pin blades slot into the internal case spaces (the pins must be parallel to the lugs). Keep the strap under tension during insertion to prevent the pins from dropping.

No, with caution. The 17mm lug width is specific to this model. Standard 18mm straps will penetrate the case poorly, creating vertical play and risk of detachment; 16mm straps will not fit at all. It is essential to purchase straps manufactured precisely for 17mm, or commission a bespoke personalised strap from a specialised atelier.

An alligator or shell cordovan strap typically lasts 5–8 years with daily wear, depending on climate, bathing frequency, skin perspiration, sun exposure, and daily abrasion. Vegetable-tanned leather tends to deteriorate more quickly (3–5 years). Surface ageing (minor creasing, colour shift) is natural and enhances the aesthetic value of artisanal patina. Replacement is recommended once the attachment points begin to separate or the leather body thins significantly.