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

The lug width of the Longines Conquest L3.320.0.87.6 is 15mm. This is a specific dimension for the ladies' models in the Conquest collection and is essential for compatibility with aftermarket straps. The measurement must be taken internally, between the lug pins, with a tolerance of ±0.2mm.

For the 30mm Conquest in stainless steel, the most appropriate materials are African alligator in matte finish (for classic sobriety), shell cordovan in vegetable tanning (for aesthetic evolution over time), calf leather with fine grain (for immediate versatility), and FKM rubber (for contemporary sports practicality). The choice depends on daily use and personal aesthetic preference: natural materials emphasise formal occasions, whilst rubber prioritises functionality.

Strap replacement requires a specific tool: a spring bar removal tool or pin extractor. Position the watch on a clean surface, locate the pins fastening the lugs to the case, gently insert the extractor from the outer side, and apply uniform pressure until the pin detaches. Repeat on the opposite lug. Install the new strap by reversing the procedure, ensuring that the pins are perfectly aligned in the slots on both sides.

Yes, provided the aftermarket strap is constructed with 15mm lugs. Specialised manufacturers of artisanal straps, such as MilanoStraps, offer straps compatible with this width. It is essential to verify that the new strap shows no abnormal tension once installed and that the internal lug width matches the standard Conquest dimension.

A high-quality natural leather strap (alligator, cordovan, calf) typically lasts 3–5 years with moderate daily wear, varying based on frequency of use, ambient humidity, and maintenance. Prolonged humidity exposure reduces lifespan; conversely, dry environments extend it. Regular maintenance (gentle cleaning and annual conditioning) significantly extends the strap's useful life.