Strap for Prestige Gold 21 Diamond

The Longines Les Grandes Classiques L4.228.7.85.6 features a lug width of 20 millimetres. This measurement represents the distance between the case lugs and is essential for selecting compatible straps. Always verify this specification with a digital calliper to avoid purchasing straps with incorrect widths that would not fit properly.

The best strap depends on intended use and personal preference. For maximum elegance, alligator in cognac-brown tones complements the yellow gold case and develops natural patina over time. Black or dark brown calf leather offers sober versatility. For sports or casual contexts, a NATO in pearl grey or sand beige maintains refined aesthetics. Shell cordovan in red-brown is the choice for those seeking consciously bold colour contrast.

Strap replacement requires a specific tool (spring bar tool) or replacement pins. Position your watch on a soft surface. Use the spring bar tool to press the side pins, freeing the old strap. Align the new pins in the case holes and press until they click. Verify that pins are inserted firmly. If preferred, entrust the task to a professional: the Casati Milano atelier provides installation services with personal consultation.

Yes, a wide range of 20-millimetre aftermarket straps is available online and through specialised artisans. MilanoStraps offers straps in alligator, calf leather, NATO and technical rubber, customisable in sizes, initials and stitching thread colour. Casati Milano also creates bespoke straps with personal leather selection and 18-month warranty. Always verify that the declared width is exactly 20mm to ensure compatibility.

Leather strap longevity depends on material and frequency of wear. Alligator and calf leather with vegetable tanning typically last 5–8 years with routine maintenance. Shell cordovan, being more resilient, may reach 10+ years. Climate, wearing frequency and care significantly influence durability. To preserve your strap, avoid prolonged water exposure and clean regularly with a soft cloth. Casati Milano guarantees 18 months on all works and provides maintenance consultation.