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Archimede · Klassik

Strap for Archimede Klassik UA7939BM-C2.31

The Klassik Chronograph Stainless Steel / Black / Bracelet takes 18 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

18mm
18 mm strapsAll Archimede
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Lug width18 mm
Case diameter42 mm
ReferenceUA7939BM-C2.31
FamilyKlassik
MovementETA caliber 7750 Hours, Minutes, Small seconds | Date, Day | Chronograph
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

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

Standard spring bar · length 18 mm · Ø 1.8 mm double flange · industry standard, no brand part number

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Klassik Chronograph Stainless Steel / Black / Bracelet — watch

Your watch with our straps

Klassik UA7939BM-C2.31 with Vintage Brown Calfskin Strap — Natural Patina
Klassik UA7939BM-C2.31 with Brown Italian Leather Strap
Klassik UA7939BM-C2.31 with Black Saffiano Strap Ecru Stitching

Calf, Brown

Vintage Brown Calfskin Strap — Natural Patina

€98

★ 4.9 · 11

See the strapAll 18 mm straps

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Real photos of the strap and the case. No generated images.

What I'm asked about the Archimede Klassik UA7939BM-C2.31

What strap size does the Archimede Klassik UA7939BM-C2.31 take?

The Archimede Klassik UA7939BM-C2.31 needs 18 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 Archimede Klassik UA7939BM-C2.31 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 Archimede Klassik UA7939BM-C2.31?

Yes, in 18 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 Archimede Klassik UA7939BM-C2.31?

A 18 mm box calf. You'll find it ready in the 18 mm collection. If you'd rather have something built on your wrist, the Casati atelier.

For changing the strap

Classic Strap and Bracelet Removal Tooltwo-tip spring bar tool→Milano Straps Premium Swiss Standard Watch Bucklestang buckle, steel or PVD→Leather Conditioner Milano Strapsnourishes and protects the strap→Casati Milano Rectangular Epsom Leather Travel Case — Brownfor the watch and spare straps→

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

Updated on · by Antonio Zichichi