Strap for Portugieser Annual Calendar Stainless Steel / Green / Middle East

The lug width of the Portugieser IW5035-10 is 22 millimetres. This measurement represents the distance between the two metal attachment lugs of the case where the strap is housed. It is a precise and deliberate dimension, calculated by IWC to ensure optimal proportions between the 44.20 mm case and wearing ergonomics. Any strap paired with this model must respect this measurement strictly to avoid mechanical play or forcing within the lugs.

The choice depends on intended use and aesthetic preference. For formal occasions, we recommend alligator in grey-blue or champagne, or vegetable-tanned calf in medium brown. If you seek an elegant and durable solution that ages gracefully, shell cordovan combines natural water resistance with a lustre that dialogues perfectly with the steel case. For a more sporting interpretation, a NATO in navy blue or a perforated rubber strap transforms the Portugieser IW5035-10 into an exploratory instrument without sacrificing its formal dignity.

The change is accomplished via quick-release pins housed within the lug apertures. Using a dedicated tool or a small flathead screwdriver, apply gentle downward pressure on the pin until you hear a click of disengagement; the strap releases immediately. Reinstallation is equally intuitive: the new strap aligns with the pin holes and locks into place with a second click. The entire operation takes less than one minute. If you prefer professional assistance, Casati Milano offers this service by appointment, guaranteeing zero risk of case scratching.

Yes, provided the strap is specifically constructed for a 22 millimetre lug width and its internal guides have been calibrated correctly by the manufacturer. Milano Straps' artisanal offerings respect this specification. However, generic or lower-quality straps may present loose manufacturing tolerances, causing undesirable lateral movement. To ensure impeccable fit, always choose a maker familiar with the precise geometry of the Portugieser IW5035-10 and offering lug customisation options.

Longevity varies according to material and daily wear. An artisanal vegetable-tanned calf strap, worn regularly, maintains structural integrity for 3–5 years, after which stitching may require servicing. Alligator, being thicker, typically delivers 5–7 years of wear without failure, thanks to leather composition. Shell cordovan, being inherently waterproof and firm, can exceed 10 years with periodic maintenance (cleaning and conditioning every 12–18 months). Rubber or NATO straps offer longer durability but with less precious aesthetics. Casati Milano provides an 18-month warranty on all artisanal straps, covering manufacturing defects and stitch servicing.