Strap for Da Vinci Chronograph Stainless Steel / Black

The lug width of the IWC Da Vinci IW3764-21 is 24 millimetres. This dimension is measured between the inner lugs of the case and is essential for ensuring proper strap compatibility. A 24 mm lug width is not standard in the horological landscape—20 and 22 mm are more common—but represents a deliberate choice by IWC to balance the 43.10 mm case. Any aftermarket strap must strictly adhere to this specification.

Alligator leather in vegetable tanning is the most appropriate choice from both aesthetic and functional perspectives. A dark cacao or cognac alligator emphasises the angular geometry of the case and the refinement of the IWC 89360 movement, creating a purely formal composition. Burgundy shell cordovan represents an alternative of exceptional quality: it develops a natural patina over time, transforming the piece into an object of personal sedimentation. For more dynamic use, smooth grey pearl calf introduces contemporaneity whilst maintaining formal rigour.

Strap replacement requires extraction of the spring bars that connect the strap to the case lugs. Using a dedicated tool—available from jewellers or specialised ateliers such as Casati Milano—gently press the spring bar inward to release the strap from one end. Repeat the operation on the opposite shoulder. Thread the new strap through following the reverse path, ensuring both spring bars are firmly positioned in the lug recesses. We recommend having this operation performed by professionals to avoid scratching the case or damaging the bars.

Yes, provided the strap meets the 24 millimetre lug width specification. Many manufacturers offer custom straps in this specific size, including Milano Straps which proposes artisanal collections in alligator, shell cordovan, calf and technical materials. It is essential to verify before purchase that the strap is designed for 24 mm and not standard sizes (20, 22 mm), as forcing a mismatched strap compromises the structural integrity of the case.

The lifespan of a leather strap depends on material, frequency of use and maintenance. A high-quality vegetable-tanned alligator offers longevity of 5–7 years with daily wear, as the fibrous structure resists mechanical wear and progressive oxidation. Shell cordovan, particularly durable, can last 8–10 years whilst developing an ever-richer patina. Calf leather, more delicate, typically lasts 3–5 years. To extend lifespan: rotate use with other straps, protect the strap from salt water and prolonged moisture, occasionally apply natural balms specifically formulated for fine leathers. Milano Straps offers straps with an 18-month warranty covering manufacturing defects and latent vices.