Strap for Conquest 41 Automatic Ceramic

The Longines Conquest L3.657.4.86.2 features a 21mm lug width. This measurement was calibrated by Longines to maintain correct proportions with the 41mm case. To verify your lug width, measure the distance between the inner edges of both spring bars with a digital calliper, positioning it perpendicular to the case.

The choice depends on your use case. For formal elegance, we recommend alligator in smoke grey or dark brown, which creates striking contrast with the mother-of-pearl dial. For daily versatility, havana or cognac calf leather offers aesthetic balance. If you prioritise sustainability, vegetable-tanned leather develops authentic patina over time. For sporty wear, a navy NATO fabric strap is ideal.

The Longines Conquest L3.657.4.86.2 uses spring bars to secure the strap to the lugs. Using a spring bar tool, gently push the bar inward to create space, then slide out the old strap. Insert the new strap by aligning its holes with the spring bars. This procedure takes seconds and requires no expensive tools.

Yes, any 21mm strap is compatible with the Longines Conquest L3.657.4.86.2. The critical requirement is that the lug width is exactly 21mm to avoid lateral play. You can purchase ready-to-ship straps online or bespoke straps from Casati Milano atelier with complete freedom in leather selection and stitching details.

A quality leather strap develops patina over 3-5 years of regular use. Lifespan depends on tanning quality, daily wear intensity and maintenance. Vegetable-tanned leathers age beautifully, developing natural lustre. Alligator leather, due to its thickness, resists longer. Casati Milano offers an 18-month warranty on bespoke straps.