Strap for Master Collection 40mm Power Reserve Stainless Steel / Silver-Arabic / Alligator XL

The lug width is 21mm. This measurement represents the distance between the case lugs and must be respected strictly to ensure correct strap installation. An undersized strap (20mm) will cause lateral play; an oversized strap (22mm) will not seat completely within the lugs.

Alligator leather represents the most aesthetically coherent choice, with its natural grain pattern complementing the brushed steel case perfectly. Shell cordovan is ideal for those seeking a strap that develops patina over time. Vegetable-tanned calf offers an artisanal character. All these materials are available in 21mm format on milanostraps.it.

Use a spring bar tool with a flat tip to remove the lug pin from its seating. Position the tool tip into the small lateral groove of the pin, applying gentle and constant pressure until disengagement. Verify that the new strap has 21mm lugs before installation. Never force pins; excessive pressure damages Longines cases.

Yes, provided it is manufactured to certified 21mm specifications. Artisanal straps from milanostraps.it are crafted to precise tolerances, ±0.5mm. It is advisable to confirm with the supplier before purchase that the strap will fit perfectly on your specific case lug configuration.

Durability depends on material and usage frequency. Alligator, if treated periodically with colourless balm, lasts 5–8 years. Shell cordovan, being more robust, can exceed 10 years. Vegetable-tanned calf evolves aesthetically whilst remaining functional for 4–6 years. Leather in daily contact with the wrist experiences natural wear; Casati Milano provides an 18-month warranty on bespoke straps.