Strap for Conquest 39 Automatic Black

The lug width of the Longines Conquest L3.676.4.58.6 is 19 millimetres. This measurement, taken between the inner spring bar holes, determines compatibility with artisanal straps. It is a less common width compared to 20 or 22 millimetres, requiring straps specifically engineered for this dimension.

The best strap depends on intended use. For formal elegance, alligator in vegetable tanning or burgundy shell cordovan are authoritative choices. For everyday versatility, black matte calfskin with deployante buckle offers comfort and adaptability. For the original sports heritage of the Conquest collection, a NATO in cordura maintains the military identity.

Strap change requires extraction of the spring bars from the lug shoulders. A spring bar tool is necessary, or authorised watchmaker service is recommended. The procedure is straightforward for experienced hands; for novices, professional assistance prevents case damage.

Yes. Any artisanal strap with 19-millimetre lug width is mechanically compatible. Quality aftermarket straps often surpass OEM counterparts, offering superior material choice (alligator, shell cordovan, vegetable-tanned leather) and full personalisation.

Longevity depends on material and use. Alligator or shell cordovan in vegetable tanning, with proper care, lasts 5–7 years of daily wear. Calfskin may last 3–5 years. Humidity, perspiration and sun exposure reduce lifespan. An artisanal strap from Casati Milano includes 18-month warranty and can be refurbished periodically.