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Eterna · Adventure

Strap for Eterna Adventure 7755.40.50.1289

The Royal KonTiki Chronograph Strap takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

20mm
20 mm strapsAll Eterna
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Lug width20 mm
Case diameter42 mm
Reference7755.40.50.1289
FamilyAdventure
MovementEterna caliber 3916A Hours, Minutes, Small seconds | Date | Chronograph, Column wheel, Flyback
Year2014
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

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

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What I'm asked about the Eterna Adventure 7755.40.50.1289

What strap size does the Eterna Adventure 7755.40.50.1289 take?

The Eterna Adventure 7755.40.50.1289 needs 20 mm between the lugs, usually 16 mm at the buckle. It's the size I've been fitting on it for years.

Can the strap on the Eterna Adventure 7755.40.50.1289 be changed?

Yes. It has spring bars between the lugs: with the right tool the strap comes off in a minute. If you'd rather not risk a scratch, I do it in the workshop.

Can I put a leather strap on the Eterna Adventure 7755.40.50.1289?

Yes, in 20 mm leather. On a 42 mm chronograph I like box calf: it holds its shape and carries a substantial case.

Which strap do you recommend for the Eterna Adventure 7755.40.50.1289?

A 20 mm box calf. You'll find it ready in the 20 mm collection. If you'd rather have something built on your wrist, the Casati atelier.

Straps for the Adventure 7755.40.50.1289

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Adventure 7755.40.50.1289, seen from the bench

The Eterna Adventure ref. 7755.40.50.1289 is powered by the automatic Calibre 3916A with flyback chronograph functions and a column-wheel mechanism. The movement offers hour, minute, small second, date and chronograph indications with a column-wheel chronograph mechanism. The technical specifications include a flyback system for instant resetting of the chronograph during operation.

Frequently asked questions

Which strap is most suitable for the Eterna Adventure 7755.40.50.1289?

The choice depends on usage context and material preferences. For formal environments or daily wear, we recommend brown alligator or vegetable-tanned calf, both developing natural patina over time. For sporting vocations, a charcoal grey or black nylon NATO strap enhances the chronograph's functionality. For moisture resistance, synthetic rubber represents the most pragmatic solution.

Can I use an aftermarket strap compatible with the Eterna Adventure 7755.40.50.1289?

Absolutely, provided it respects the 20mm lug width. Milano Straps offers a certified selection of straps for this width, crafted in premium leather or synthetic materials, all tested against the original case geometry. Compatibility is guaranteed by the specific 20mm measurement.

How long does a leather strap last under daily wear?

A quality leather strap, subjected to daily use, maintains structural integrity between 3-5 years depending on tanning method (vegetable-tanned ages more rapidly, alligator remains stable longer). Routine replacement becomes necessary when the leather begins to deteriorate, typically after 18-24 months of intensive use. Milano Straps offers matched replacements to ensure aesthetic continuity over time.

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.

Request an appointment →

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

The atelier's website: casatimilano.com