Omega
De Ville 424.13.40.21.03.002 (aka: 42413402103002)— lug 20mm

The lug width of the De Ville 424.13.40.21.03.002 is exactly 20 mm. This dimension defines the width of the compatible strap and must be measured perpendicularly between the lugs of the case. Straps of 19 or 21 mm are not acceptable; manufacturing tolerance is minimal. The correct measurement is performed with a calliper between the lugs, at the point where the strap runs under the spring bar.

The recommended material is alligator leather in vegetable tanning, in cognac or tobacco brown tones, which naturally complements the champagne dial. An elegant alternative is smooth calfskin for those preferring a more understated dress character. Shell cordovan represents a refined choice for those who appreciate natural patina. For summer versatility, a canvas-backed rubber strap with steel deployant is practical without compromising the model's identity.

The procedure requires a tool called a spring bar tool or a small flat screwdriver. Position the watch on a soft cloth to avoid scratches. Identify the spring bars (small metal rings) positioned horizontally at the ends of the lugs. Gently lever the spring bar to release it, then extract the pin that holds the strap. Repeat on the other side. To install the new strap, reverse the procedure: insert the pin into the passageways, then snap the spring bars into position. If in doubt, contact Casati Milano for personalized advice.

Any strap with a 20 mm lug width is geometrically compatible. However, to maintain the model's stylistic identity, we recommend noble leathers such as alligator, calfskin, shell cordovan, or artisanal-quality rubber. Avoid synthetic leather straps or those with multicoloured stitching. To maximize visual harmony and longevity, choose suppliers who understand the value of the De Ville and offer custom artisanal craftsmanship.

Durability depends on the material, climate, and frequency of use. Quality alligator or calfskin leather, subject to ordinary care (occasional cleaning, avoiding prolonged exposure to water and perspiration), maintains functionality and aesthetics for 24–36 months. Shell cordovan, being denser, can last 4–5 years while developing a fascinating patina. A rubber strap lasts 12–18 months before showing signs of wear. To extend its lifespan, rotate between multiple straps and allow the leather to breathe after use.