Eterna · Contemporary

Strap for Madison Eight-Days Silver

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter39 mm
Reference7720.41.13.1229
FamilyContemporary
MovementEterna caliber 3510 Hours, Minutes, Seconds | Big Date
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the Contemporary 7720.41.13.1229

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Contemporary 7720.41.13.1229, seen from the bench

The Eterna Contemporary 7720.41.13.1229 combines Eterna's watchmaking heritage since 1856 with modern design. It features the Eterna caliber 3510 automatic movement with big date display, housed in a 38.50mm stainless steel case. The 20mm lug width is precisely engineered to maintain aesthetic balance with alternative straps while ensuring optimal interface between case and band.

Frequently asked questions

What is the lug width of the Eterna Contemporary 7720.41.13.1229?

The lug width of the 7720.41.13.1229 is 20mm. This dimension is determined by the geometry of the 38.50mm case and is essential for selecting compatible straps that maintain correct aesthetic proportions.

Which strap is most suitable for the Eterna Contemporary 7720.41.13.1229?

For this model, a vegetable-tanned alligator strap or high-quality calf leather enhances the modern architecture of the brushed stainless steel case. Cognac or dark brown tones offer aesthetic continuity, whilst a grey NATO proposes contemporary dynamism.

How do you change the strap on the Eterna Contemporary 7720.41.13.1229?

The 7720.41.13.1229 features standard removable 20mm spring bars. Using a spring bar tool, remove the bar from the rear seat, extract the original strap, and insert the new strap. The operation requires care to avoid scratching the case.

What is the average durability of an artisanal leather strap for the 7720.41.13.1229?

A vegetable-tanned leather strap of quality, worn daily, maintains structural integrity for 2-3 years. Durability depends on ambient humidity, frequency of use, and maintenance. Regular care with specific creams significantly extends the strap's lifespan.

Is the original strap of the 7720.41.13.1229 compatible with other 20mm watches?

Yes, the 20mm lug width is an international standard. However, aesthetic proportions vary depending on case design: a strap engineered for the Contemporary may not enhance watches with different caseback configurations or diameters. Constructive compatibility does not imply aesthetic harmony.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only