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

The Longines Master Collection L2.718.4.70.6 features a lug width (ansa width) of 21mm. This measurement represents the free space between the vertical flanges of the case and is critical for ensuring strap compatibility. To measure the lug width correctly: place a ruler on the interior plane of the attachment seat and record the distance between the walls. 21mm is a professional measurement less commonly found in standard catalogues, which is why selecting compatible straps requires specific attention to this specification.

Strap selection depends on intended use and aesthetic context. Alligator leather treated with vegetable tanning represents the formal excellence solution: natural geometric grain enhances case architecture without chromatic competition. Brushed or polished calf offers versatility, adapting to both formal and sporting contexts, with patina developing authentically over time. For those practising water sports or seeking maximum functionality, Cordura canvas NATO or Fluoroelastomer rubber guarantee superior resistance and rapid drying. Shell cordovan, the noblest horse leather, represents the choice for collectors aware of intrinsic value and aesthetic evolution over time.

The Longines Master Collection L2.718.4.70.6 employs a standard spring bar system. Procedure: use a dedicated tool (spring bar tool) with a fork or thin blade to gently press the bar horizontally, creating slight flexion. The bar extracts from its seat, freeing the previous strap. Insert the new bar into the new strap's seat, ensuring locking spheres are correctly positioned. Reinsert the bar into the lug recesses, verifying the spring returns to its rectilinear position. For maximum safety, professional watchmaker assistance is advisable to avoid stress to the case.

Absolutely. Certified quality aftermarket straps are perfectly compatible with the Longines Master Collection L2.718.4.70.6, provided they respect the 21mm lug width specification. Selecting an artisanal strap enables aesthetic and functional personalisation: leather selection among alligator, calf, shell cordovan; colour choice; stitching in silk or dyed cotton thread; custom closure system (simple buckle or deployante). Reliable brands guarantee durability and construction quality even superior to original standards, with tanning and resistance certifications. It is an opportunity to adapt the instrument to your personal preferences.

A leather strap's lifespan varies significantly based on tanning quality, usage frequency, climate conditions and maintenance. A good quality calf or cow leather strap, vegetable tanned, lasts on average 2–3 years with intense daily use. Alligator leather, thanks to more robust fibrous structure, can reach 4–5 years or beyond. Shell cordovan, the noblest leather, easily exceeds 5–7 years if properly maintained (protection from excessive humidity, periodic cleaning, natural conditioning). Proper maintenance—avoiding prolonged water immersion, rapid drying after water contact, applying specific protective creams every six months—significantly extends the strap's useful life.