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

The Longines Master Collection L2.718.4.70.3 features a lug width of 21mm. This specific dimension is determined by the 42mm case geometry and is critical for ensuring proper aftermarket strap compatibility, preventing mechanical play and avoiding stress on the lug holes.

We recommend straps in <a href="/pages/termine-glossario/alligatore">alligator</a> leather with fine grain texture or vegetable-tanned calf for the Longines L2.718.4.70.3. Alligator maintains formal elegance and durability; vegetable-tanned calf develops a unique patina over time. Both materials must be 21mm in width and fitted with a <a href="/pages/termine-glossario/deployante">deployant clasp</a> for comfort and security.

Strap replacement requires a spring bar tool to compress the elastic bars anchoring the strap to the case lugs. Position the watch face-up with the spring bars visible, insert the tool into the slot, apply gentle compression, and remove the old strap. Insert the new strap by aligning the spring bars and ensure they click firmly into place. If uncertain, consult an authorised service centre.

No. A 20mm strap will create excessive mechanical play on 21mm lugs, compromising aesthetics and generating structural stress during removal. You must use only 21mm-certified straps. Any measurement approximation risks permanent damage to the steel lug holes.

Strap longevity depends on tanning quality, daily wear, and maintenance practices. A quality <a href="/pages/termine-glossario/alligatore">alligator</a> or vegetable-tanned calf strap typically lasts 4-7 years with regular daily use. <a href="/pages/termine-glossario/shell-cordovan">Shell cordovan</a> can exceed 10 years of service. Regular care—gentle drying, protection from stagnant water—significantly extends leather lifespan.