Strap for Modello Uno U1S-FAI Fondo per l’Ambiente Italiano

The Unimatic Modello Uno U1S-FAI features a lug width of 22mm. This measurement is essential for identifying compatible straps: it must correspond precisely to the gap between the case lugs. You can verify this using a digital calliper, measuring from the inner edge of one lug to the other perpendicular to the longitudinal axis of the watch.

For the U1S-FAI, we recommend straps that emphasise its minimalist philosophy: an alligator strap with vegetable tanning for those preferring formal elegance with natural patina; a NATO in premium fabric for sporty daily use; structured grain leather for versatility without compromise; and vulcanised rubber for professional contexts requiring maximum robustness. The choice depends on your primary use case.

To change the U1S-FAI strap, you'll need a spring bar tool (lever instrument for retaining springs). Position the tool in the small slot beneath the lug, near the spring mechanism, and push downward simultaneously on both sides to release the lug from the spring. Gently remove the old strap and insert the new one, ensuring the springs click fully into position. Verify the strap is securely fixed before wearing the watch.

Absolutely. The U1S-FAI is compatible with any strap featuring a 22mm lug width and appropriate construction quality. Artisanal straps crafted from premium materials—such as vegetable-dyed leather, NATO in high-tenacity yarns, or professional vulcanised rubber—are not only compatible but allow you to personalise the watch according to your aesthetic and functional preferences, fully reflecting the modular design philosophy of the U1S-FAI.

Durability depends on the material and frequency of use. An alligator strap with vegetable tanning can last 5-7 years of moderate daily wear, developing a beautiful natural patina. Structured leather offers similar longevity. The quality of artisanal craftsmanship—particularly the robustness of stitching and leather calibration—is crucial: straps made with traditional methods age magnificently, whilst industrially-produced examples tend to show wear sooner. Proper maintenance (periodic cleaning, controlled sun exposure) significantly extends service life.