Unimatic · Modello Due

Strap for Modello Due U2S-MB

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

Lug width22 mm
Case diameter39 mm
ReferenceU2S-MB
FamilyModello Due
MovementTime Module caliber NH35A hours, minutes, seconds | date
Year2020
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 Due U2S-MB

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Modello Due U2S-MB, seen from the bench

The Unimatic Modello Due U2S-MB features the automatic NH35A caliber with hour, minute, second and date indications. The watch has 22mm lugs and a three-hand configuration with date. The case houses an automatic mechanical movement derived from Seiko.

Frequently asked questions

What is the lug width of the Unimatic Modello Due U2S-MB?

The U2S-MB features a lug width of 22mm. This specification is fixed and not interchangeable with common alternative widths such as 20mm or 24mm. Compatibility of a strap can be verified by measuring the distance between the two lugs using a calliper tool.

Which strap is best suited for the Unimatic Modello Due U2S-MB?

The ideal strap depends on intended use, though vegetable-tanned Tuscan leather in tobacco brown or black tones is most congruent with the Modello Due's minimalist aesthetic. For sport-oriented applications, FKM synthetic leather or NATO fabric straps are recommended. Natural alligator in restrained colourways provides a textured alternative for those seeking visual complexity without contradiction.

How does one change the strap on a Unimatic with 22mm lug width?

Strap replacement involves extraction of the spring bars—the pins connecting the strap to the watch lugs. Using a spring bar removal tool, compress the internal spring mechanism slightly to release the bar and withdraw it completely. Once the original strap is detached, insert the spring bars of the new strap into the same lugs, ensuring they engage firmly. The case back need not be opened.

Can aftermarket straps compatible with 22mm lug width be used?

Yes, aftermarket straps engineered specifically for 22mm lug width are entirely suitable. Milanostraps provides a curated selection of artisanal straps, from vegetable-tanned leather to technical textiles, all designed for this specification. Sourcing from reputable suppliers ensures precision of measurement and material quality standards.

What is the expected service life of a leather strap on the Modello Due?

Longevity depends on leather quality, wear patterns and maintenance discipline. A vegetable-tanned Tuscan leather strap of 1.6–1.8mm thickness, subject to regular care (occasional cleaning, avoidance of prolonged salt-water exposure), typically remains serviceable for 5–10 years. Vegetable tanning develops a natural patina, and the strap may be reconditioned periodically through application of leather-specific oils or waxes.

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