Strap for De Ville Master Chronometer Stainless Steel / Blue

The lug width of the 434.13.40.20.03.001 is 19 millimetres, measured from inside to inside between the fixing pins. This dimension is specific to this model and must not be confused with more common standards of 18mm or 20mm. Incompatible straps will force the fit or create unacceptable lateral play.

For this model, alligator represents the most formal and durable choice, while vegetable-tanned calfskin offers a natural patina that develops over time. Shell cordovan resists accidental moisture better. The choice depends on the context of use: alligator for formal settings, calfskin for everyday elegance, rubber or NATO fabric for casual wear.

The strap is fixed by two metal pins (spring bars) inserted into the case lugs. Using a proper spring bar remover of correct diameter, gently press the pin from one side to disengage it, then extract the pin itself. The new strap is installed by following the reverse procedure, ensuring the pin is perfectly aligned and clicks into position. If you prefer to avoid the risk, the Casati Milano atelier performs the change with precision.

Yes, provided they are constructed for a 19mm lug width. Generic straps for different sizes (18mm or 20mm) are not compatible. For the 434.13.40.20.03.001, milanostraps.it offers handcrafted straps in the exact size, customizable in leather, colour and details, with fast shipping and warranty.

Durability depends on the type of leather and usage. Quality alligator can last 5-7 years of moderate daily use, while vegetable-tanned calfskin typically lasts 3-4 years before requiring replacement. Shell cordovan is among the most durable (6-8 years). All milanostraps straps are guaranteed for 18 months, and the Casati Milano atelier offers advice on preventive maintenance.