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Montblanc · 1858

Strap for 1858 Automatic Chronograph Bronze / Champagne / Calf

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 Montblanc
Lug width20 mm
Case diameter42 mm
Reference118223
Family1858
MovementMontblanc caliber MB 25.11 Hours, Minutes, Small Seconds | Chronograph
CaseTitanium, Bronze

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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Straps for the 1858 118223

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The 1858 118223, seen from the bench

The Montblanc 1858 reference 118223 features the automatic caliber MB 25.11 with chronograph function. The movement offers indications of hours, minutes, small seconds and chronograph. The 1858 collection represents the brand's sporty line dedicated to precision instruments.

Frequently asked questions

What is the lug width of the Montblanc 1858 Reference 118223?

The <a href="/pages/termine-glossario/misura-ansa">lug width</a> of the Montblanc 1858 118223 is 20mm. This measurement is standard across the 1858 collection and ensures broad compatibility with high-quality aftermarket straps. Precision is critical: a 19mm or 21mm strap would result in misalignment within the lug holes of the case.

Which strap is best suited for the Montblanc 1858 118223?

We recommend an <a href="/pages/termine-glossario/alligatore">alligator</a> strap in honey or cognac using <a href="/pages/termine-glossario/concia-vegetale">vegetable tanning</a>: the natural texture of the leather harmonises elegantly with the developing patina of the bronze case. Alternatively, a <a href="/pages/termine-glossario/shell-cordovan">shell cordovan</a> in burgundy adds depth and character. For active use, a grey-green NATO or black FKM rubber with sandy grain preserves the exploratory authenticity of the piece.

How do I change the strap on this model?

The Montblanc 1858 118223 features standard spring bar attachments. Use a dedicated spring bar tool, or book an appointment at Casati Milano for professional fitting. Careful handling is essential given the precious titanium and bronze case materials, which may scratch if handled carelessly.

Is a 20mm aftermarket strap compatible with the 118223?

Yes, any strap with a 20mm <a href="/pages/termine-glossario/misura-ansa">lug width</a> is compatible with the 118223, provided the strap is correctly dimensioned. However, we advise against budget-grade straps: the quality of materials (tanning process, buckle finish, <a href="/pages/termine-glossario/deployante">deployant clasp</a>) must match the calibre of the case. Milano Straps curates a selection of 20mm straps in vegetable-tanned leather, NATO, and technical rubber, all tested for this watch category.

What is the typical lifespan of a natural leather strap on this watch?

A high-quality vegetable-tanned leather strap, worn in rotation (not daily for more than 5-6 consecutive days), delivers 4-6 years of aesthetic serviceability before replacement becomes desirable. Longevity depends on climate (humidity accelerates degradation), frequency of wear, and maintenance (gentle cleaning, air-drying after moisture exposure). The bronze case, when exposed to damp leather at the lugs, may develop accelerated corrosion: we recommend thoroughly drying the lugs and attachment rings after contact with water.

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