Strap for Flagship 40 Stainless Steel - Pink Gold / White - Diamond / Bracelet

The Longines Flagship L4.984.3.99.7 features a lug width of 21mm. This measurement is specifically proportioned to the 40mm case diameter to maintain the aesthetic balance of the design. To verify strap compatibility, always measure the distance between the lug holes using a calibrated tool.

Alligator represents the traditional and most elegant choice for the Flagship: its fine grain and natural leather lustre amplify the dress-watch character. Valid alternatives include vegetable-tanned calf, which develops a natural patina over time, and silk NATO for casual versatility. FKM rubber is the technical solution for humid environments or extreme water-resistance requirements.

The Longines Flagship uses standard straight spring bars with a 21mm width. To change the strap, remove the bars using a dedicated spring bar tool: position the tip beneath the bar, apply gentle pressure inward to release the internal spring, then extract the bar. Insert the new strap by positioning one end of the bar first, then compress the opposite end until it clicks into place. Verify proper alignment before wearing the watch.

Yes, numerous premium manufacturers produce 21mm straps compatible with the Longines Flagship L4.984.3.99.7. On milanostraps.it you will find a selection of straps in alligator, calf, NATO and rubber, all customisable in size, initials and stitching choice. Casati Milano atelier also offers bespoke strap creation with personal leather selection and oversight.

A quality leather strap (alligator, calf or shell cordovan) used daily has an average lifespan of 18-36 months before replacement is needed. Longevity depends on sun exposure, water exposure, heat and frequency of use. Straps made with vegetable tanning develop a patina which, although aesthetically pleasing, involves natural thinning over time. Regular maintenance (cleaning, drying, cool storage) can significantly extend strap lifespan.