Strap for GrandeVitesse Chronograph Blue Rubber

The lug width of the Longines GrandeVitesse L3.635.4.96.9 is 20 millimetres. This specification determines strap compatibility: you must measure the distance between the two straight lugs on the case with a calliper or flexible ruler to ensure correct fitting without strain.

The ideal strap depends on usage. For formal daytime wear: vegetable-tanned alligator in cognac brown or navy blue. For practicality: brushed calf with wood-grain embossing. For sport and versatility: heavyweight canvas NATO in grey or navy. For pure functionality: FKM rubber in black or blue. All are available in 20mm lug width from milanostraps.it.

Strap replacement is performed by removing the spring bar pin that connects the strap to the case lugs. Use a dedicated spring bar tool inserted gently under the pin to compress the internal spring and slide the pin out of the lug. After removing the old strap, insert the new spring bar into the seat of the new strap and slide it into the lugs until it clicks. Do not force: the bar must enter smoothly.

Yes, provided the lug width is precisely 20 millimetres. The bespoke straps from milanostraps.it and Casati Milano are engineered for complete compatibility with this case, preserving aesthetic proportions and functionality. The quality of materials—alligator, calf, FKM rubber—often exceeds factory-supplied options.

Durability depends on material and wear pattern. A quality handmade vegetable-tanned alligator strap typically lasts 3–5 years with ordinary maintenance (regular cleaning, protection from moisture and perspiration). Brushed calf resists 2–4 years. An FKM rubber strap reaches 5–7 years. Casati Milano offers 18-month warranty and can restore the strap through repair and refinishing interventions.