Strap for Master Collection Date 29 Stainless Steel

The lug width of the L2.257.4.77.6 is 15 millimetres. This measurement represents the distance between the two holes where the spring bar is inserted. It is critical to verify this dimension before purchasing an aftermarket strap, as even minimal variations can cause instability or forcing issues.

The ideal strap depends on usage and dial design. For formal elegance, we recommend lacquered alligator or vegetable-tanned calf in brown or cognac tones. For everyday versatility, powder grey calf or a technical rubber strap preserves the elegant case proportions without visual excess. Shell cordovan represents the noble compromise between constructive rigidity and natural ageing.

Removing the strap requires a specific tool (spring bar tool). Insert the bifid tip into the small lateral holes beneath the lugs, exerting gentle pressure until the spring releases. Extract the metal bar and repeat on the opposite side. To fit the new strap, insert the bar first on one side, then gently press the opposite side until the spring engages the retention holes.

Yes, many artisanal strap manufacturers create specific 15mm models. Milano Straps offers an extensive selection of compatible straps customisable in materials (alligator, calf, shell cordovan), finishes and shades. The Casati Milano atelier also provides bespoke custom services with personalised consultation and extended warranty.

Longevity depends on intensity of use and material. A quality vegetable-tanned calf, with moderate daily use, maintains structural integrity for 3–5 years. Lacquered alligator lasts longer (5–7 years) due to greater resistance to flexing. Shell cordovan, being more rigid, can last 7–10 years. Natural patina increases aesthetic value over time, making the strap increasingly personal.