Strap for Conquest Chronograph

The Longines Conquest L3.662.4.56.0 features a lug width of 21 millimetres. This is a critical specification because it represents a non-standard intermediate measurement not commonly found in universal strap catalogues, requiring bespoke straps manufactured to this precise width. To verify, measure the internal distance between the spring bar holes of the case using a digital calliper: the value must be exactly 21mm. This precision is essential for ensuring stability and proper fit of the strap on the wrist.

For the Conquest L3.662.4.56.0, we recommend a strap in natural alligator, quality artisanal calf leather, or shell cordovan, in shades of brown, dark blue, or burgundy. These materials complement the stainless steel case and the sport-oriented character of the model elegantly. If you prefer daily practicality, a vulcanised rubber or NATO fabric strap in black offers resistance without aesthetic compromise. Your choice depends on the intended use and your personal preferences for aesthetics and maintenance.

Strap replacement is straightforward: obtain a steel spring bar or appropriate tool to extract the spring bars. Rest the watch on a soft cloth with the lugs facing upward, locate the holes where the spring bar sits, insert the tool to compress the internal spring, and slide the bar out of the case. Repeat for the lower lug. Insert the spring bars into the new strap following the same procedure. Ensure the bars are fully seated and the strap is aligned with the case.

Yes, but with precision: the aftermarket strap must have an exact lug width of 21 millimetres. This is the only critical variable. Many standard market straps are manufactured for 20mm or 22mm, so they would not fit properly. When purchasing online, always verify that the seller specifies 21mm. Artisanal ateliers such as Casati Milano produce bespoke straps for this precise width, guaranteeing perfect compatibility and superior construction quality compared to universal standards.

Durability depends on the material and usage. An alligator or quality artisanal calf strap, with proper maintenance—avoiding prolonged soaking and extreme humidity exposure—lasts 5–8 years. Shell cordovan is even more durable, reaching 10+ years. Deterioration typically begins in the flexing area at the wrist and around the buckle zone. Casati Milano guarantees their straps for 18 months and offers repair services. By rotating straps, you extend the life of each, preserving shape and material integrity.