Strap for Master Collection 42 24h Stainless Steel / Silver-Arabic / Bracelet

The lug width of the Longines Master Collection L2.718.4.78.6 is 20 millimetres. This measurement is the established construction standard for the case and is essential for correct strap fitting. A 20mm strap seats perfectly within the lugs without excessive play or mechanical stress. Respecting this technical specification ensures stable attachment and proper mechanical compatibility.

Selection depends on intended use and aesthetic purpose. For formal contexts, a polished black alligator or vegetable-tanned calf in medium brown represents the classic solutions. For everyday versatility, vegetable-tanned calf in cognac brown offers balance between elegance and practicality. For sports use, ballistic nylon NATO or Tropic-style rubber strap emphasises functionality. Shell cordovan in burgundy is ideal for those seeking a noble leather that develops character patina over time.

Strap replacement requires specific tools: a spring bar tool and a flat work surface. Position the watch securely, then extract one spring bar at a time by inserting the lever into the small gap beneath the lug and lifting gently. Once both pins are extracted, the original strap disengages. To fit the new strap, position the spring bar in the lug cavity and press firmly until you feel the retention click. Repeat on the second side. If inexperienced, contact Casati Milano for professional replacement service.

Yes, all 20-millimetre straps are mechanically compatible. Numerous options in noble leather, fabric and rubber are available online and through Casati Milano. Compatibility is guaranteed by the standardisation of the 20mm lug width. It is advisable to verify that the strap is manufactured with quality leather and precision finishing to maintain aesthetic coherence with the quality construction of the Swiss timepiece.

Durability depends on leather quality, frequency of use and climatic conditions. High-quality alligator or shell cordovan resists 3-5 years of daily wear. Vegetable-tanned calf typically lasts 2-3 years with regular use, developing aesthetic patina over time. Leather is vulnerable to prolonged moisture exposure and dragging damage. To extend life, avoid complete water immersion and periodically apply leather-specific protective creams. A superior-quality strap from Casati Milano includes an 18-month guarantee.