Chopard
Imperiale 278559-3002— lug 20mm

The lug width of the Chopard Imperiale 278559-3002 is 20 millimetres. This dimension is critical for aftermarket strap compatibility: any strap purchased must have a width of exactly 20 millimetres to insert correctly into the case lugs. A strap of different width will either not fit or create excessive mechanical play.

For the Chopard Imperiale 278559-3002, an alligator leather strap represents the finest option: its regular texture and fine grain enhance the formal elegance of the case. An equally fascinating alternative is vegetable-tanned calfskin, which develops a rich patina over time, revealing warm and profound nuances. For more informal wear, a NATO strap in technical fabric offers versatility without compromising style.

The strap of the Chopard Imperiale 278559-3002 is secured by removable pins (spring bars) that pass through the case lugs. To remove it, you must use a specific tool (spring bar tool) to compress the small metal pins and extract the strap from the attachments. A new 20mm strap is then inserted in the same manner. If unfamiliar with the operation, it is advisable to consult an expert watchmaker.

Yes, it is entirely possible to mount a 20-millimetre aftermarket strap on the Chopard Imperiale 278559-3002. Quality aftermarket straps—particularly those in artisanal alligator, calfskin, or cordovan—offer endless customisation options without compromising the mechanical integrity of the watch. The case remains unaltered and the original strap can always be remounted.

A high-quality leather strap—alligator or vegetable-tanned calfskin—can last 4 to 8 years of daily wear, depending on frequency of use and climatic conditions. Excessive humidity and prolonged sun exposure accelerate leather ageing. A rubber or elastomer strap has a shorter lifespan, generally 2–4 years. Regular maintenance—gentle cleaning and occasional treatment with specific balms—significantly extends the life of the strap.