Strap for Conquest Quartz 29.5 Stainless Steel / Black - Diamond

The Longines Conquest L3.277.4.57.6 features a 15mm lug width, an uncommon intermediate size that requires careful selection when sourcing replacement straps. To verify precisely, use a digital calliper to measure the perpendicular distance between the two lug attaching points, excluding the spring bar pins. Always consult your original warranty certificate if in doubt.

Alligator leather with vegetable tanning is the ideal choice: it enhances the sports-elegant character of the Conquest and develops a beautiful natural patina over time. For alternatives, fine-grained calf leather offers classical elegance, whilst cotton NATO ensures practicality for dynamic daily wear. Shell cordovan is extraordinary but demands precise aesthetic awareness.

Strap replacement requires a spring bar tool. Position your watch on a flat surface, use the tool to compress the spring bar pin on one side, gently remove the old strap, then insert the new one the same way. If inexperienced, entrust the task to a professional watchmaker or our Casati Milano atelier to avoid scratching the case.

Yes, Milan Straps offers a comprehensive collection of artisanal 15mm straps compatible with your Conquest. All our straps are crafted from selected leathers, precise stitching, and professional finishing. For a bespoke experience, Casati Milano atelier creates made-to-measure straps with direct consultation and 18-month warranty.

A quality leather strap, particularly vegetable-tanned, typically lasts 3-5 years with moderate daily wear. Durability depends on intensity of use, water exposure, and humidity. Vegetable-tanned leathers develop a fascinating patina with age but may gradually thin. Preventive replacement is advised every 4-5 years; with careful maintenance and alternating use, longevity increases significantly.