IWC
Grande Complication IW9270-20— lug 18mm

The attachment lug of the IWC Grande Complication IW9270-20 measures 18 millimeters. This specific width reflects the structural proportions of the 42.20 mm case and allows the strap to integrate without mechanical tension on the platinum lugs.

European alligator dyed in Bourbon barrels is the most versatile choice: it maintains a discreet texture that does not compete with the platinum, develops a deep patina over time, and ages in a controlled manner. Vegetable-tanned calf represents a refined alternative, with a delicate grain that takes on smoky tones after two years of use.

Use a spring bar tool to gently lift the lateral clips of the lug spring while pulling the old strap outward. Insert the new attachments into the eyelets of the new leather, ensuring the spring returns completely into place. Avoid forcing to prevent damage to the platinum case finishes.

Any quality strap with an 18 millimeter lug width is compatible with the Grande Complication. We recommend manufacturers that use stainless steel or titanium attachments to avoid scratching the platinum, and that offer precise widths from the buckle hole to the heel (typically 16-17 cm for average wrists).

A quality alligator or vegetable-tanned calf strap typically lasts 3-5 years with daily use before showing visible signs of deterioration such as deep cracks or peeling. Natural aging is part of its aesthetic value. Casati Milano guarantees custom-made straps for 18 months, with the option of leather regeneration over time.