Strap for Unimatic Modello Quattro U4

The U4 features a standardised lug width of 22 millimetres. This measurement, taken between the two case lugs, ensures broad compatibility with Italian and international aftermarket straps and bracelets. It represents the ideal compromise between versatility and specificity, guaranteeing numerous options without aesthetic compromise.

The U4 shines when paired with straps that amplify its minimalist and functional essence. An alligator strap with vegetable tanning evokes the heritage of European tool watches, whilst a military green NATO emphasises the tactical soul of the piece. For everyday wear, vegetable-tanned calf leather offers durability and a patina that evolves with time. Rubber is the correct choice for sports and aquatic contexts, fully exploiting the 100-metre water resistance.

Strap replacement on the U4 is accomplished by removing the spring bars—the small elastic rods that secure the strap to the case lugs. Use a dedicated spring bar remover tool to gently extract the rod from within the lug slots, rotating slightly to ease tension. Once one spring bar is freed, the strap slides away effortlessly. The operation requires only a few minutes and demands no specialist knowledge.

Yes, the 22mm lug width guarantees total compatibility with any strap of identical width, regardless of manufacturer. This is a key strength of the Modello Quattro: your U4 can wear Italian artisanal straps, specialised sports solutions, vintage leather or tactical rubber without any adaptation required. The essential criterion is verifying the width (22mm) and construction quality of the new strap.

The longevity of a vegetable-tanned leather strap depends on frequency of use, climate conditions and maintenance discipline. With regular daily wear and basic upkeep—occasional cleaning, protection from excessive moisture—an artisanal calf leather strap retains functionality and appearance for 3–5 years. Many users prefer rotating between two or three straps to extend the lifespan of each, allowing the leather to 'rest' between wears.