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Unimatic · Modello Tre

Strap for Modello Tre U3-RUF-B 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-B
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-B

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

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

The Unimatic Modello Tre features a 22mm lug case that gives the timepiece a robust proportion. The U3-RUF-B reference is distinguished by the minimalist design characteristic of the Italian brand. The watch maintains the essential lines typical of the Unimatic design philosophy.

Frequently asked questions

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

The lug width is 22mm. This dimension is critical for strap compatibility: the spring bars must be exactly 22mm apart. Always verify with a digital calliper before ordering an aftermarket strap.

Which strap do you recommend for the Modello Tre U3-RUF-B?

Tuscan vegetable-tanned leather is the natural choice: it develops a rich patina over time that dialogues perfectly with the brushed steel case. For those desiring understated luxury, alligator leather offers a regular and natural grain. For motorsport purists, a black NATO with racing contrast stitching maintains the RUF Automobile heritage of the watch.

How do I change the strap on the U3-RUF-B?

Use a spring bar tool to gently remove the current lug pins. Insert the new bars into the 22mm strap by aligning the holes correctly. Attach the strap at one end, then the other, ensuring the pin is fully seated in the lug. Verify there is no excess play in the strap.

Which aftermarket straps are compatible with the Modello Tre?

Any strap with a 22mm lug width is compatible with the U3-RUF-B. Milano Straps supplies exclusively 22mm straps tested in vegetable-tanned leather, alligator, chromexcel leather, NATO, and FKM rubber, verified to ensure perfect fitment without tolerance issues.

How long does a leather strap last on this watch?

A well-maintained vegetable-tanned leather strap lasts between 5 and 10 years. Longevity depends on humidity exposure, frequency of use, and maintenance. The patina that develops is a sign of natural and compelling ageing, not degradation. An alligator strap, being more durable, can last 15+ years. Rotate your straps to distribute wear.

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