Strap for Flagship Héritage Chronograph Calendar

The lug width of the L4.792.8.77.2 is 20mm, measured as the distance between the two spring bar pins protruding from the case lugs. Longines selected this specific width to maintain correct proportions with the 40mm case diameter, ensuring elegance on the wrist without excessive lateral protrusion.

We recommend alligator in vegetable tanning (develops natural patina), shell cordovan (organic lustre develops with wear), or superior-grade calf leather for a more versatile option. Selection depends on intended use and colour preferences. Dark brown alligator creates perfect equilibrium with blue or satin-finished dials.

The L4.792.8.77.2 uses fixed spring bars for strap attachment. Remove the old strap by compressing the spring bar pin on one side using a dedicated tool, extract the spring bar, then insert the new strap's lugs at precisely 20mm width and ensure both pins seat correctly within the case.

Yes, an aftermarket strap is fully compatible provided the lug width is exactly 20mm. We advise against 22mm or 24mm straps as they create excessive play and poor visual results. Bespoke leather straps from Casati Milano ensure construction precision and material quality aligned with the watch's value.

Leather strap longevity depends on daily wear and maintenance. Superior-grade alligator or cordovan maintains structural integrity for 3–5 years with daily use; less prestigious calf may deteriorate faster in humid environments. With proper care (drying after moisture exposure, annual conditioning), artisan straps easily achieve 5–7 years of useful life.