Strap for Conquest Automatic 41mm Black

The Longines Conquest L3.658.4.56.6 features a lug width of 21.00mm. This measurement is taken between the two lugs (attachment points) on the case and determines strap compatibility. It is essential to select a strap specifically sized at 21mm to avoid lateral play or fitting issues.

The choice depends on usage and personal aesthetic. For elegance: an alligator strap with vegetable tanning, which elevates the Swiss refinement. For everyday versatility: smooth calf leather (box or vegetable-tanned). For aquatic sports: natural rubber or FKM. For retro styling: NATO canvas. We recommend alligator or calf in cognac, black, or dark blue tones for optimal harmony with the case's satin-brushed steel finish.

Strap replacement requires removable spring bars on both sides. Use a dedicated spring bar tool or a small flathead screwdriver to compress the spring, extract it, and remove the old strap. Insert the new 21mm strap, ensuring the spring bar clicks into place on both lugs. Verify secure attachment before wearing the watch. If unfamiliar with the procedure, consult a qualified watchmaker.

No, it is not recommended. The 21mm lug width is specific, and a universal strap (typically 18mm, 20mm, or 22mm) will not fit properly, causing lateral play or preventing insertion. We recommend certified 21mm straps from reputable artisanal makers or brands. On milanostraps.it, you will find a curated selection of 21mm-compatible straps, customisable and guaranteed.

Longevity varies with material and usage. An alligator or vegetable-tanned calf strap typically lasts 3–5 years with daily wear, extendable to 7–10 years with occasional use and proper maintenance (gentle cleaning, quick drying after humidity exposure). Rubber straps last 4–6 years, NATO canvas 5–8 years owing to textile durability. Natural patina indicates adaptation, not wear. Casati Milano straps are backed by an 18-month warranty.