Strap for Modello Quattro U4S-BRZ-ML Massena Lab

The lug width of the Quattro U4S-BRZ-ML is 22 mm. This standard allows the tool watch to be paired with a wide range of artisanal straps, avoiding the limitations imposed by proprietary solutions. The 22 mm lug width maintains balanced proportions on the case, ensuring a perfect fit without flared effects.

The Quattro reaches its full expression with straps in natural alligator or vegetable-tanned calf leather, as they share the principle of evolving patina with the bronze case. Alternatively, a heavy cotton Oxford NATO or FKM rubber offers calibrated contrast. We recommend against glossy chrome-tanned leather straps, which would appear extraneous to the watch's design philosophy.

To change the strap, you must remove the vertical spring bars that support the lug attachment. Using a dedicated tool (spring bar tool), gently lift one of the bars whilst extracting the strap from the centre. The new strap, constructed for 22 mm lug width, inserts easily by repositioning the bars in place. The operation requires just a few minutes and no specialised equipment.

Yes, the Quattro accepts aftermarket straps constructed for 22 mm lug width. Unimatic's choice of 22 mm represents a deliberate decision: this standard allows the watch to be paired with a broad ecosystem of artisanal straps, including custom-made options from specialised ateliers such as Casati Milano.

The lifespan of a vegetable-tanned leather strap depends on intensity of use and environmental conditions. With daily wear, a superior quality strap maintains structural integrity between 3 and 5 years. The advantage of vegetable tanning is that the strap softens and patinas magnificently during this period, improving tactilely and visually. Replacement is not a necessity, but an opportunity to refresh the Quattro's aesthetic.