Strap for Flagship 30 Stainless Steel / White - Diamond / Bracelet

The lug width of the Longines Flagship L4.374.4.27.6 is 15mm, measured centre-to-centre between the spring bar pins on the case. This non-standard dimension requires specific strap selection; standard 14mm or 16mm straps are not compatible.

African alligator with regular grain is the reference choice, as it enhances the harmonious proportions of the 30mm case. Alternatively, European calf leather with vegetable tanning offers superior durability and elegant natural patina. Anthracite rubber straps provide versatility between formal and casual contexts.

Strap change requires a spring bar tool: insert the flat tip between the lug and case, push the internal spring outward, and extract the pin. Operate with caution to avoid scratching the case. We recommend having the operation performed by a watchmaker or Casati Milano if you lack the appropriate tool.

Yes, provided it features 15mm lugs. Quality artisanal aftermarket straps offer superior personalisation compared to genuine Longines accessories. Milano Straps offers a specialised range of 15mm-compatible straps in fine leather.

A premium quality leather strap (alligator, shell cordovan, or vegetable-tanned calf) typically lasts 7–9 years with daily use. Longevity depends on leather type, frequency of use, and care: avoid prolonged water exposure and periodically apply specific conditioner to preserve leather elasticity.