Strap for Portugieser Perpetual Calendar 5021 White Gold / Blue

The lug width of the Portugieser IW5021-21 is 22mm, an unconventional measurement that requires specifically dimensioned straps. This width is determined by the proportion between the case diameter (44.20mm) and the height of the mounting, and does not correspond to traditional ISO standards (18mm, 20mm, 24mm). It is essential to measure accurately the distance between the inner pins to avoid instability or damage to the lugs.

For the white gold Portugieser, alligator leather with fine grain remains the conservative and elegant choice, capable of highlighting the dial without competing with the case metal. Shell cordovan offers quasi-metallic compactness and develops a natural patina over time. Vegetable-tanned calf introduces a more articulate texture. Heavy cotton NATO straps function as a contemporary counterpoint, emphasising the model's maritime heritage.

To change the strap, gently remove the old strap from the lugs using a dedicated tool (spring bar tool). Locate the two small pins that run through the lugs: apply light lateral pressure to extract the pin, then insert the new strap. Ensure the new strap has a 22mm lug width to guarantee stability and correct alignment. Avoid applying excessive force to the lugs to prevent scratching the white gold.

Yes, all quality straps with a 22mm lug width are compatible with the Portugieser IW5021-21, regardless of manufacturer. However, we recommend verifying that the strap is made from noble leathers (alligator, calf, shell cordovan) and fitted with precious metal hardware, in line with the quality and prestige of the timepiece. A well-constructed aftermarket strap can enhance the model's aesthetics and allow colour variability over time.

The lifespan of a leather strap depends on the quality of the material, daily use and maintenance. A premium alligator or calf, under moderate wear conditions (worn 3-4 days per week), maintains structural integrity for 3-5 years before showing significant signs of wear. Shell cordovan, thanks to its natural density, has a longer lifespan (5-7 years). The patina developed during this period adds aesthetic character. Straps made with vegetable tanning age in a controlled manner, developing darker tones and softer texture over time.