Strap for Conquest 29.5 Quartz Ceramic

The Longines Conquest L3.257.4.57.2 features a 15 mm lug width. This measurement is factory-specified and certified by Longines: any replacement strap must respect this exact width to ensure correct installation and stability. Measurement is taken from the inner point of the left lug to the inner point of the right lug in a horizontal line.

For this model, alligator leather straps in black or cognac brown pair elegantly, enhancing the two-tone stainless steel and ceramic case. Vegetable-tanned calf leather with natural patina introduces warmth and documents the passage of time. Shell cordovan represents the pinnacle of craftsmanship: tactile thickness and natural lustre that dialogue perfectly with the satin-finished ceramic. A NATO in dark grey or navy blue offers sportive-urban versatility.

The strap is replaced using a spring bar tool. Position the flat end of the tool under the metal eyelet (spring bar) connecting the strap to the lug, apply gentle lateral pressure to compress the internal spring and slide the strap outward. Repeat for both lugs. The operation takes minutes and requires no specialist knowledge.

Yes, provided the strap has a 15 mm lug width and the internal spring bar diameter matches the original. Many artisanal straps are made to measure and offer superior quality to OEM alternatives: noble leathers, hand-stitching, personalisation in initials and thread choice. Always verify compatibility with the supplier before purchase.

A quality leather strap (alligator, vegetable-tanned calf, shell cordovan) lasts 3–5 years with regular use, provided basic maintenance: protection from prolonged water exposure, occasional cleaning with a damp cloth and air-drying. Vegetable tanning ennobles with age; the ceramic case does not deteriorate. Craftspeople such as Casati Milano offer 18-month warranty on bespoke straps. After thread wear or leather fatigue, the strap can be restored by specialists.