Strap for Conquest 30 Stainless Steel / Green - Diamond / Bracelet

The Longines Conquest L3.320.4.07.6 features a lug width of 15 millimetres. This measurement corresponds to the spring bar attachments: measure the net distance between the two metal pins at 3 and 9 o'clock on the dial. At 15mm, this is a specialised dimension requiring straps specifically constructed for this width, incompatible with standard 18mm or 20mm sizing.

We recommend three options for your Conquest: alligator in neutral tones (black, taupe brown, deep burgundy) for classical elegance without compromise; full-grain calf leather with vegetable tanning for versatility and progressive aging patina; shell cordovan for legendary durability and increasing internal lustre. Choice depends on daily use and personal maintenance preference. All these materials preserve the visual restraint the Conquest requires.

Strap replacement on the Conquest is straightforward: use a spring bar tool (small steel instrument with bifid tip) or small flat-head screwdriver. Carefully insert the tool into the lateral groove of the lug, pushing upward to extract the primary spring pin. Once the old strap is removed, align the new strap's holes and reinsert the pin. If uncertain, the Casati Milano atelier performs this service in minutes.

Yes. The milanostraps.it catalogue offers artisanal straps in multiple materials and finishes specifically constructed for the 15mm lug width. Each strap is customisable in length, leather tone, stitching thread colour and buckle type (standard deployant or bespoke buckle). Compatibility is guaranteed by standard 15mm spring bars; your Conquest will accept any strap constructed for this width.

Leather strap longevity depends on material and usage. Vegetable-tanned alligator maintains structural integrity for 4–6 years of daily wear, then requires reconditioning; shell cordovan exceeds 7–8 years under normal conditions. Full-grain calf lasts approximately 3–4 years before visible edge wear appears. Humidity exposure, sunlight and wearing frequency influence aging. The Casati Milano atelier offers reconditioning and spring bar replacement with 18-month warranty on all commissioned straps.