Strap for Conquest 29.5 Automatic Double Row Diamond

The lug width of the Longines Conquest L3.180.0.57.6 is 15mm, a non-standard dimension requiring straps specifically manufactured for this width. Measurement must be taken from the inside of the lug flanges between the two spring bar attachment points. Even a minor discrepancy (such as 16mm) would result in unacceptable structural play.

For the Conquest L3.180.0.57.6, alligator straps are recommended for formal occasions, vegetable-tanned leather for everyday versatility with developing patina, or vulcanised rubber for those prioritising practicality and water resistance. Milano Straps offers dedicated selections of artisanal 15mm straps in these materials.

To change the strap, remove the spring bars from the original lugs using a spring bar tool. Position the tool in the spring bar slot, apply gentle pressure to retract the pin, and carefully slide the bar from the lug. Insert the same bar into the new 15mm strap and secure it firmly in the recesses.

Only straps specifically manufactured for 15mm lugs are compatible. Standard 16mm or 18mm straps are not suitable. Milano Straps maintains a specialised catalogue of artisanal 15mm straps in various materials: alligator, calf leather, shell cordovan, NATO and rubber, all verified for precise compatibility.

A quality artisanal leather strap, such as those crafted for the Conquest L3.180.0.57.6, typically lasts 4–6 years with moderate daily use. Vegetable-tanned leather develops natural patina over time. Milano Straps guarantees personalised straps for 18 months and offers reinforcement or buckle replacement services upon request.