Strap for Flagship Chronograph

The Longines Flagship L4.803.4.12.6 features a lug width of 20mm. This measurement is specific to this model and ensures correct proportions between the 39mm case and the strap. Measurement should be taken inside-to-inside between the lug bars using a calliper for accuracy.

The best strap depends on intended use and aesthetic preference. For formal contexts, we recommend black or dark brown alligator; for structured everyday wear, vegetable-tanned calf leather which ages beautifully; for absolute longevity, Horween shell cordovan. All materials should feature a deployant clasp, which properly distributes tension on the lug.

Removing the strap requires a small spring bar tool. Insert the tool into the small lateral hole of the lug, gently push to compress the internal spring, and slide the strap outward. Proceed carefully to avoid scratching the case. Insert the new strap following the reverse path, ensuring the bar is firmly positioned.

Yes, any strap with a 20mm lug width is compatible. However, we recommend verifying the strap's construction quality, as the Flagship deserves artisanal realisation. Bespoke straps allow selection of material, colour, closure type and finishing according to your preferences.

Durability depends on material and usage. Vegetable-tanned calf resists 3-4 years in daily use if regularly maintained; shell cordovan lasts 7-10 years or beyond; genuine alligator offers 4-5 years of reliability. Leather ageing, especially vegetable-tanned, is aesthetic and imparts character. NATO textile straps provide superior durability in extreme conditions.