Strap for Conquest Quartz 29.5 Stainless Steel - Diamond / Black

The Longines Conquest L3.300.0.57.6 features a lug width of 15mm. This measurement represents the distance, measured from inside to inside, between the two pins that support the strap. It is a precise and non-negotiable dimension: a strap with a different width, even by a single millimetre, will appear disproportionate and may not fit correctly between the watch's lugs.

For the Longines Conquest L3.300.0.57.6, alligator or vegetable-tanned leather straps represent the most refined choices. Genuine alligator enhances the understated appeal of the steel case with irregular grain and a natural patina that develops over time. Vegetable-tanned calf leather offers greater rigidity, ages gracefully and maintains colours with consistency. For more casual everyday contexts, NATO-style straps in cotton or technical rubber guarantee functionality without compromise.

Strap replacement requires a specific tool, typically a spring bar tool. Locate the pins (spring bars) that pass through the lugs: position the curved end of the tool under the pin, apply gentle upward pressure to retract the internal spring, then remove the old strap. Insert the new strap (with 15mm lugs) by aligning the holes at the ends of the pins and release: the pin will snap into place. Repeat on the other side. If uncertain, consult a professional: pins must not be damaged.

Yes, any strap commercially available with a 15mm lug width is compatible with the Longines Conquest L3.300.0.57.6. However, aesthetic and construction quality varies considerably. Artisanal straps in noble leather (alligator, shell cordovan, vegetable-tanned calf) or premium fabrics guarantee durability and a patina that evolves over time. Milano Straps offers custom straps in bespoke sizing, colour and detailing, along with specialist advice on harmonious combinations with your Conquest.

A noble leather strap, with regular maintenance, typically lasts 3-5 years of daily wear. Factors such as sun exposure, humidity, perspiration and frequency of use influence longevity. Vegetable-tanned calf resists moisture better than delicate alligator. Although more fragile, alligator develops a remarkable patina and can be regenerated with restoration services. Milano Straps provides an 18-month warranty on artisanal straps and recommends seasonal rotation to extend service life.