Strap for Conquest Automatic 39 Ceramic

The lug width of the Longines Conquest L3.655.4.86.2 is 19mm. This is the internal distance between the two lugs on the case where the strap is inserted. To verify, measure the width parallel to the movement using a digital calliper, ensuring a reading of 19.00±0.5mm for full compatibility.

For the Conquest L3.655.4.86.2 featuring a mother-of-pearl dial and black ceramic bezel, we recommend authentic alligator (honey or cognac tone) with a satin-finished steel deployante, or shell cordovan in dark shades (aged burgundy, deep black) on a steel pressure clasp. Both amplify the luminosity of the mother-of-pearl through contrast, without competing optically with the case textures.

To change the strap: 1) Obtain a spring bar tool or consult a watchmaker. 2) Place the watch on a stable surface. 3) Insert the tool into the lateral lugs to depress the internal elastic pin. 4) The old strap will slide out. 5) Insert the new strap in the same manner, ensuring both pins are securely engaged. If inexperienced, consult a professional to avoid case damage.

Yes, the Conquest L3.655.4.86.2 is fully compatible with quality aftermarket straps, provided the lug width is exactly 19mm. It is essential to verify this dimension before purchase. At milanostraps.it you will find a selection of 19mm straps in alligator, shell cordovan, vegetable-tanned leather and rubber, all tested for compatibility with modern Longines Conquest models.

The lifespan of a leather strap depends on material and usage. High-quality alligator and shell cordovan last 8–12 years under normal daily wear conditions. Vegetable-tanned calf visibly ages and may last 5–8 years. Wear accelerates with prolonged exposure to saltwater (relevant for a diving watch like the Conquest). Rubber or NATO straps last indefinitely, though leather keepers age normally. Casati Milano atelier offers an 18-month guarantee on tailored work.