Strap for Modello Quattro U4-BTS x BAIT Inquisitive Explorer

The lug width of the Unimatic Quattro U4-BTS is 22mm. This is the distance between the two lugs (the lateral extensions of the case) where the strap is attached. To verify compatibility, measure the space between the lugs with a calliper: it must be exactly 22mm. This dimension allows you to use a wide range of contemporary straps whilst maintaining optimal proportions with the 40mm case.

The Quattro U4-BTS pairs excellently with alligator straps featuring vegetable tanning, which develop a rich patina over time. For a more contemporary aesthetic, we recommend high-quality regenerated calf leather. If you seek versatility, a NATO fabric strap ensures daily practicality whilst maintaining formal elegance. For wet environments or sporting use, natural rubber represents the most reliable technical solution. Your choice depends on usage patterns and the patina you wish to develop.

Strap replacement requires a specific tool: a spring bar removal tool. Position the watch on a flat surface, insert the thin end of the extractor into the small hole beneath one lug, and gently push downwards to release the spring. Repeat on the other side. Once the springs are freed, the old strap slides away. To install the new strap, align one end first, then gently push the other end until the spring clicks into place. Avoid forcing: correct installation requires no excessive effort.

Absolutely. The 22mm lug width is an international standard, so you can choose any compatible strap from specialised brands. Always verify that the strap thickness is coherent with the lug geometry: overly thick straps may create structural tensions. Milano Straps offers a curated selection of 22mm straps in noble materials, from alligator options to technical fabrics, all tested for construction robustness and dimensional compatibility.

A leather strap's lifespan depends on usage intensity, climatic conditions, and material quality. An alligator strap with vegetable tanning can last 5–8 years with moderate daily use, developing increasingly rich patina. Regenerated calf leather offers a slightly shorter lifespan, approximately 4–6 years, but with more uniform wear. Economy leather straps may show deterioration within 2–3 years. To extend longevity, avoid prolonged humidity exposure, remove the watch before bathing, and periodically apply a dedicated leather balm. Regular maintenance is determinant.