Strap for Flagship Chronograph Black Diamond

The lug width is exactly 20 mm. This measurement requires construction tolerance of ±0.2 mm to ensure correct strap insertion into the case lugs. It is not a standard measure in industrial catalogues, therefore each strap must be manufactured with certified precision.

Alligator leather with vegetable tanning remains the most coherent choice with the model's aesthetic identity. The regular texture of the scales and the natural patina that develops with use establish an elegant dialogue with the satin-finished stainless steel case. Alternatively, vegetable-tanned calf leather with fine grain offers a more contemporary narrative, or shell cordovan with vegetable tanning for those desiring a burgundy tone that tends toward dark brown.

The change requires a specific tool to remove the springbars from the case lugs. Place the watch on a soft surface, locate the access holes for the undersized pins on the inner side of the lug, insert the tool until the pin is disengaged, remove the old strap, and insert the new one with controlled pressure until it clicks. If you do not have the tool, the Casati Milano atelier offers a free strap change service for straps ordered through them.

Yes, provided it strictly respects the 20 mm lug width. Straps from brands other than Longines, manufactured with correct tolerance, are fully compatible. Always verify the technical specification with the seller: a 0.5 mm margin determines the impossibility of insertion. We recommend specialised artisanal brands that certify manufacturing tolerance.

Durability depends on the material, usage, and maintenance. Alligator or calf leather in vegetable tanning, subject to moderate daily use, maintains structural integrity for 3-4 years. Shell cordovan, being more resistant, can last even 5-6 years. Maintenance consists of regular cleaning with a slightly dampened cloth and periodic treatment with neutral balm. Springbar replacement is the most frequent intervention, easily performed by a specialist watchmaker.