Strap for Flagship 35.6 Automatic Two Tone White Diamond

The lug width of the Longines Flagship L4.774.3.27.7 is 18 mm. Measurement is taken from the inner base of one lug to the other, perpendicular to the case, excluding the attachment terminals. This dimension is proportionate to the 35.60 mm case diameter and maintains the aesthetic equilibrium characteristic of Longines heritage design.

We recommend straps in dark brown alligator or aged cordovan, which enhance the understated elegance of the stainless steel satin-brushed case. Alligator offers regular cellular texture and complex patina development over time; cordovan provides superior cellular density and potential longevity of twenty years. For sporty use, cotton-linen NATO or premium horological-grade rubber complete the offering without compromising design integrity.

Strap replacement is performed by extracting the spring bars that secure the lugs to the case. Use a dedicated spring bar tool to compress the internal spring slightly, remove the bar and detach the old strap. Align the new strap's lugs with the case holes, then reinsert the spring bars. Verify both bars are fully seated before wearing the watch.

Yes, provided the lug width is exactly 18 mm. We offer a curated collection of artisanal 18mm straps compatible with your Flagship, in various materials and finishes. Browse our online selection or contact the Casati Milano atelier for full personalisation with leather choice, dimensions and artisanal details.

An artisanal-quality leather strap typically lasts 5–10 years of daily wear, depending on material: chromium-tanned alligator resists 6–8 years, cordovan up to 20 years due to superior cellular density. Durability depends on exposure to moisture, sunlight and weekly wearing frequency. All our straps carry an 18-month warranty against manufacturing defects.