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Unimatic · Modello Tre

Strap for Modello Tre U3-RUF-G RUF

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

Lug width

22mm
22 mm strapsAll Unimatic
Lug width22 mm
Case diameter42 mm
ReferenceU3-RUF-G
FamilyModello Tre
Year2024
CaseStainless Steel

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 Modello Tre U3-RUF-G

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Modello Tre U3-RUF-G, seen from the bench

The Modello Tre by Unimatic features a case with 22mm lugs. The watch belongs to the collection identified by the reference U3-RUF-G. This is a timepiece with the minimalist design characteristic of the Italian brand.

Frequently asked questions

What is the exact lug width of the Unimatic Modello Tre U3-RUF-G?

The lug width of the U3-RUF-G measures precisely 22 millimetres, calculated between the inner points of the lugs, excluding the spring bars. This measurement is standard for the model and allows the use of any 22mm aftermarket strap currently available.

Which strap is most suitable for the Unimatic Modello Tre U3-RUF-G?

We recommend straps crafted in vegetable-tanned leather, particularly natural full-grain Tuscan leather. This material develops authentic patina over time and harmonises perfectly with the minimalist and vintage-forward aesthetic of the black dial. Alternatively, semi-aniline calf leather for formal contexts, or nylon NATO straps for sporting use.

How do you change the strap on the Unimatic Modello Tre U3-RUF-G?

The U3-RUF-G employs standard spring bars. To replace the strap: remove the spring bars using a dedicated spring bar tool, detach the previous strap, insert the bars into the lower position of the new 22mm strap, then re-lodge the bars into the lugs. This operation requires no specialist watchmaking expertise.

Can I use an aftermarket strap compatible with the Unimatic Modello Tre U3-RUF-G?

Yes, absolutely. Any 22mm strap equipped with standard spring bars is compatible. We recommend verifying strap thickness (ideally 3.5–4.5 mm) to ensure correct suspension on the lugs and comfort when wearing the watch.

How long does a leather strap last on the Unimatic Modello Tre U3-RUF-G?

Durability depends on material and usage. High-quality vegetable-tanned leather straps maintain structural integrity for 5–8 years with daily wear and correct maintenance (drying after water contact, occasional conditioning with mink oil). Shell cordovan may last 10–15 years. Nylon NATO straps offer similar longevity to leather but prove more resistant to tension.

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