Strap for Unimatic Modello Uno U1

The Sinn U1 features a lug width of 22 millimetres. This width is the standard specification for professional diving watches in this category and ensures balanced proportioning with the 44-millimetre case. Accurate measurement is performed by placing an internal calliper within the strap seat, measuring from lug to lug.

For the Sinn U1, we recommend a NATO Premium in neutral colours (black, navy blue, military green) for intensive underwater use, or a robust calf with vegetable tanning for mixed applications. Alligator represents the most sophisticated choice if operating in marine environments: the scale structure naturally resists saltwater. Thermosetting rubber is ideal for extreme diving operations.

Strap replacement on a diving watch is performed by removing the lug spring bars using a dedicated tool. Ensure you work on a clean surface to avoid losing components. Insert the new strap by threading the spring bar into the lug seat, applying pressure until complete seating is achieved. Verify that the strap is aligned and the passants are correctly positioned before wearing the watch.

Yes, any strap with a 22-millimetre lug width is compatible with the Sinn U1. Milano Straps offers a complete range of artisanal straps in this specification, verified for fit and constructional quality. We recommend verifying that the passant thickness does not exceed 4.5 millimetres to ensure optimal comfort.

A quality leather strap, subjected to regular cycles of immersion in freshwater and saltwater, has an average lifespan of 18-24 months with proper maintenance. Rinsing the strap with fresh water after each marine immersion, drying it completely, and applying a natural conditioner every 3-4 months significantly extend useful life. Vegetable tanning offers greater resistance compared to rapid industrial methods.