Strap for Da Vinci Chronograph Stainless Steel / Black

The lug width of the IW3764-03 is precisely 24 millimetres. This measurement represents the internal space between the two lugs of the case where the strap is inserted. It is essential to verify this dimension with a digital calliper before ordering an aftermarket strap, as a different lug width will not be compatible and will not fit correctly into the case lugs.

For the 43mm Da Vinci IW3764-03, alligator leather (with fine grain and robust structure), shell cordovan for those desiring a warm, cognac-coloured ageing patina, vegetable-tanned Italian calf leather for a contemporary and sustainable result, or technical FKM rubber for intensive daily use are recommended. Alligator remains the traditional choice that best complements the tonneau geometry of the stainless steel case.

To change the strap, you will need a dedicated spring bar tool. Insert the tip of the tool into the small opening of the metal lug (spring bar) on the side of the case, press downwards to compress the spring, remove the lug from the hole, then detach the old strap. The reverse procedure installs the new strap: position the lug in the hole of the new strap, insert the spring bar tool tip, compress and guide the lug into the second hole of the case.

Yes, you may use an aftermarket strap compatible with 24mm lug width. Handcrafted straps produced for this measurement are entirely interchangeable with the original IWC strap, provided they respect the exact 24mm lug width and appropriate total length for your wrist. Many enthusiasts choose artisanal alligator or shell cordovan straps for aesthetic personalisation whilst maintaining original technical specifications.

The durability of a leather strap depends on usage frequency, chosen material and maintenance. High-quality alligator, used daily with care, typically resists visible wear at the shoulders (contact points with lugs) for 3–5 years. Shell cordovan tends to last longer due to the density of equine fibre. Regular maintenance (drying after moisture exposure, annual conditioning with colourless wax) significantly extends the strap's useful life.