Strap for Conquest Quartz 41mm Black Leather

The lug width (ansa width) of the Longines Conquest L3.659.4.56.3 is 21mm. This measurement is taken by positioning a digital calliper between the outer margins of the spring bar pins on the inner shoulder of the case. It is crucial not to confuse this with the more common 20mm or 22mm standards: a single millimetre error results in uneven strap tension and potential aesthetic damage to the case.

The choice depends on intended use and dial colour. For classical elegance with sporting vocation, we recommend vegetable-tanned alligator in dark brown or black, which creates harmony with the brushed steel case. For daily versatility, cognac vitello with vegetable tanning ensures comfort and natural patina development. If your model has explicit nautical heritage, a cordura NATO in grey or black maintains functional authenticity. For pure elegance, dark brown or black shell cordovan delivers an emerging natural lustre over time.

The Conquest uses standard spring bars for strap attachment. To remove the old strap, use a spring bar tool to gently compress the spring and release the pin. Repeat on the other lug. Insert the new strap pins into the case slots and allow the spring to snap into place. If you prefer to avoid any risk of scratching, consult a professional watchmaker or contact Casati Milano for installation service. The procedure takes 2-3 minutes if executed correctly.

Yes, provided the lug width is precisely 21mm. Many standard aftermarket straps measure 20mm or 22mm and would cause uneven pressure or excessive play. Milano Straps manufactures bespoke 21mm straps specifically compatible with your Conquest, in a variety of premium leathers (alligator, vitello, shell cordovan, rubber) and customisable in length, initials and thread colour. Always verify lug width before purchase.

A premium leather strap (alligator, vitello or vegetable-tanned shell cordovan) typically lasts 5–8 years with moderate daily use. Longevity depends on ambient humidity, frequency of wear and maintenance. Natural leather straps develop attractive patina over time, but the material inevitably thins and wears. Milano Straps guarantees 18 months on artisanal straps and permits restoration or replacement through the Casati Milano atelier. To maximise lifespan, avoid prolonged exposure to extreme humidity and rotate between multiple straps regularly.