Longines
Master Collection L2.357.4.73.6— lug 18mm

The lug width of the Longines Master Collection L2.357.4.73.6 is 18 millimetres. This is a non-standard measurement in contemporary watch catalogues, requiring careful sourcing of compatible straps. To verify compatibility, measure the distance between the inner shoulders of the lugs on the case: it must correspond exactly to 18 mm. Imprecise straps generate visual instability and premature wear.

For this 34 mm case, a vegetable-tanned alligator in cognac or mahogany brown is the optimal choice: it honours the classical heritage, develops natural patina over time, and guarantees decades of durability. An alternative is French calf in pearl grey for a more contemporary aesthetic. For casual sporting contexts, a navy or slate-grey NATO strap preserves formality without excess.

Strap replacement requires a quality spring bar tool to avoid scratching the stainless steel case. Position the tool beneath the metal spring holding the strap to the lugs and push with steady pressure. Withdraw the spring downward and the strap detaches. Insert the new strap by feeding the spring into its aperture, ensuring it is fully seated. If inexperienced, consult a certified watchmaker or personalisation service.

Yes, entirely. Artisanal aftermarket straps are the norm for this model. Provided the lug width is 18 mm and the strap is crafted from noble materials—alligator, calf, shell cordovan—the visual result surpasses factory straps. Verify measurement tolerances: a half-millimetre discrepancy is visible and compromises the case's aesthetic balance.

A vegetable-tanned alligator strap, properly maintained, lasts 10–15 years; shell cordovan reaches 15–20 years; French calf lasts 5–8 years in daily-wear contexts. Longevity depends on usage frequency, moisture exposure, and maintenance (rapid drying after rain, avoiding chlorine and heavy perspiration). An 18-month artisanal guarantee covers construction defects; patina and natural wear are legitimate material evolution.