Unimatic · Modello Uno

Strap for Modello Uno U1-C Colette

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
ReferenceU1-C
FamilyModello Uno
MovementTime Module caliber NH38 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 U1-C

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Modello Uno U1-C, seen from the bench

The Unimatic Modello Uno U1-C is equipped with the NH38 caliber featuring hours, minutes and seconds indication. The watch has 22mm lugs and adopts a minimalist design approach. The movement offers the essential functions for daily use.

Frequently asked questions

What is the lug width of the Unimatic Modello Uno U1-C?

The lug width of the U1-C is 22mm, measured from inner wall to inner wall between the two lugs of the case. This dimension is compatible with all straps specifically manufactured for this size and determines compatibility with aftermarket watch straps.

Which strap is best suited for the Unimatic U1-C?

For the U1-C, we recommend vegetable-tanned Tuscan leather straps (for timeless elegance), alligator with fine grain (for character and restrained sheen), or military-grade NATO nylon (for practicality and historical heritage). Each choice must align with the minimalist philosophy of the brushed steel case.

How do you change the strap on a watch with 22mm lugs?

Use a spring bar tool to remove the elastic pin from one lug, keeping the new strap vertically aligned. Insert one end of the pin into the case shoulder, then position the other end into the new strap's slot, finally insert the pin into the opposite lug. A delicate operation requiring precision to avoid scratching the case.

Are 22mm aftermarket straps fully compatible with the U1-C?

Yes, provided the lug width is rigorously 22mm. A strap manufactured to specification can be mounted directly on the watch without modifications. It is essential to verify that the strap shoulders do not extend beyond the case edges and that the spring bar is proportioned to the lug width.

How long does a leather strap last on a watch worn daily?

A high-quality strap made from vegetable-tanned leather typically lasts 4-7 years of regular use, developing a natural patina that increases its aesthetic value. Durability depends on climate (humidity accelerates wear), frequency of use, and maintenance (regular dusting, avoiding stagnant water). The typical failure point is the stitching, not the leather itself.

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