Strap for Portugieser Chronograph Stainless Steel / Blue

The lug width is precisely 20 millimetres. This measurement must be verified by placing a digital calliper between the two internal terminals of the attachment point. Do not confuse with other case dimensions: 20mm is the space where the strap is anchored.

This depends on intended use and aesthetic preference. For formal elegance, tobacco-brown or deep black alligator emphasises the dial's authority. For daily versatility, vegetable-tanned calf develops natural patina over time. For sporting contexts, a NATO in anthracite grey or deep blue maintains chronograph spirit. FKM rubber is the choice of the functional purist.

Strap replacement requires a specialised tool (spring bar tool). Position the tool in the small lateral hole of the tension spring, relieve the spring's pressure and slide the lug out of the terminal. Repeat on the other side. Insert the new strap, aligning it perfectly on both terminals, ensuring the spring regains maximum tension. If inexperienced, consult a professional or Casati Milano atelier.

Yes, numerous options exist. Any strap with a 20-millimetre attachment is compatible. Best aesthetic results are achieved with thicknesses between 3.5 and 4.5 millimetres: this ensures harmonic transition between case and wrist. Always verify that the lug terminals are smooth and residue-free before installation.

A quality alligator or calf strap lasts approximately 3-5 years under moderate daily use. Longevity depends on exposure to perspiration, humidity and maintenance habits. Clean the strap every 2-3 months with a soft, slightly damp cloth and air-dry. Annual conditioning with purpose-formulated creams significantly extends lifespan. Rubber or NATO straps have different wear cycles—generally shorter for rubber, but with lower replacement costs.