Strap for Conquest 39 Automatic Blue

The lug width of the Longines Conquest L3.676.4.99.6 is 19mm. This measurement is taken from the inside of the left lug shoulder to the inside of the right lug shoulder. It is a rare width in contemporary catalogues, requiring bespoke or custom-made straps to ensure proper fit and attachment.

For the Conquest L3.676.4.99.6, alligator straps (formal reference solution), shell cordovan (evolving patina towards burgundy tones), vegetable-tanned calf (constructive irregularities and personal development), or NATO for sporty contexts are recommended. The choice depends on usage: formal for alligator, versatile for cordovan, dynamic for calf, sporty for NATO. All straps must respect the 19mm lug width.

Strap replacement is performed by extracting the lug pins (spring bars) using a dedicated tool (spring bar removal tool). Position the pin from inside the lug on its release hole, gently remove the strap, align the new strap's lug hole with the pin, then return the pin to locked position. Verify that the strap is secured symmetrically on both sides.

Yes, there are compatible 19mm aftermarket straps custom-made. MilanoStraps offers a collection of straps in various materials (alligator, cordovan, calf, NATO) ready for shipment and customisable for sizing, initials, and thread colour. The Casati Milano atelier also creates fully personalised straps with leather selection and 18-month warranty.

The lifespan of a leather strap depends on the tanning type and frequency of use. A well-maintained alligator lasts 4-5 years, shell cordovan 3-4 years, and vegetable-tanned calf 2-3 years due to lower fibre density. Sun exposure, humidity and perspiration accelerate wear. Keeping the strap dry and protected from direct sunlight significantly extends its lifespan.