Unimatic · Modello Uno

Strap for Modello Uno U1S-MN

Takes 22 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width22 mm
Case diameter42 mm
ReferenceU1S-MN
FamilyModello Uno
MovementSellita caliber SW200-1 b Hours, Minutes, Seconds
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 Modello Uno U1S-MN

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Modello Uno U1S-MN, seen from the bench

The Unimatic Modello Uno U1S-MN is a 41.50mm stainless steel chronograph featuring a minimalist industrial design. Powered by a Sellita SW200-1 automatic movement, it displays hours, minutes, and seconds under a sapphire crystal. The 22mm lug width ensures compatibility with standard aftermarket straps, offering versatility in materials and finishes while maintaining ergonomic proportions and everyday wearability.

Frequently asked questions

What is the lug width of the Unimatic Modello Uno U1S-MN?

The lug width of the U1S-MN is 22mm. This measurement represents the distance between the two case lugs that hold the strap. To verify compatibility, measure the space between these lugs: it must be exactly 22mm. All straps with this lug width are fully compatible with your Modello Uno.

Which strap is most suitable for the Unimatic Modello Uno U1S-MN?

For the U1S-MN we recommend alligator straps in superior quality for sober elegance, vegetable-tanned calf for natural evolution over time, NATO in cordura for tactical versatility, or perforated rubber for summer functionality. The choice depends on your lifestyle: if you seek continuity with the industrial soul of the case, opt for neutral tones (black, grey, dark brown). If you prefer organic contrast, dark chocolate alligator amplifies everyday sophistication.

How do I change the strap on the Modello Uno U1S-MN?

To replace the strap, use a spring bar tool (special instrument to remove the lugs). Insert the small hook of the tool into the cylindrical hole of the lug towards the upper side of the case, push gently downward until the metal pin is released, then remove the strap. Repeat on the other side. To install the new strap, align the holes with the lugs and press the metal pin until it clicks into position. Ensure the strap is symmetrical on the case.

Can I use an aftermarket strap compatible with the Modello Uno U1S-MN?

Yes, absolutely. The U1S-MN uses standard 22mm lugs, which means any strap with this lug width is completely compatible. Aftermarket straps of superior quality—particularly those from Milano Straps with vegetable tanning or alligator—guarantee both longevity and aesthetic coherence with the minimalist design of the case.

How long does a leather strap last on the Modello Uno U1S-MN?

Durability depends on the material and intensity of use. A superior quality alligator strap lasts 5-7 years with daily wear and regular maintenance (cleaning, protection from extreme humidity). A vegetable-tanned calf strap has a similar lifespan, but develops visible patina within 6-12 months of use. Perforated rubber resists for 3-4 years before showing significant wear. To prolong its life, avoid prolonged moisture, occasionally apply protective balm, and alternate straps if possible.

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