Strap for Flagship 40 Stainless Steel - Yellow Gold / White / Bracelet

The lug width of the Longines Flagship L4.984.3.22.7 is 21mm, a specific dimension for this reference. It is the distance between the spring bar pins that attach the strap to the case, measured centre-to-centre. This width ensures ideal aesthetic proportion with the 40mm case.

We recommend a French alligator leather in vegetable tanning, or shell cordovan for maximum longevity. Both amplify the sartorial language of the watch. Vegetable-tanned calf is the ideal compromise: immediate softness, evolving patina over time, chromatic versatility. We advise against rubber or sports materials: they contradict the formal identity of this model.

Extract the spring bars from the case using a spring bar remover: insert the curved tip into the lateral groove of the pin, push gently to release the spring. Once extracted, the old strap detaches. Position the new strap in the lug and reinsert the pin until mechanical lock. Never force: steady, gentle pressure is sufficient. If uncertain, entrust to a professional watchmaker.

Yes, provided it is certified for 21mm lug width. Quality aftermarket straps (such as those from milanostraps.it) are constructed with geometric tolerances equivalent to OEM (original equipment manufacturer) straps. Always verify that the strap is stitched with polyester or linen thread; vegetable-tanned linen offers superior longevity to synthetic alternatives.

A natural leather strap (alligator, cordovan, vegetable-tanned calf) lasts 3-5 years with daily wear, provided correct maintenance: avoid prolonged exposure to water, salt sweat, direct heat. Shell cordovan extends to 7-10 years since the fibre is denser. Vegetable tanning guarantees greater longevity than industrial tanning methods. Proper conditioning every 6-8 months (with watch-specific creams) significantly extends useful life.