Iwc 2025 Gst Perpetual Calendar Chronograph. It was available in either titanium or stainless steel, and with the dial markings done. Perpetual calendar 43mm chronograph white dial ref.
With a full perpetual calendar even displaying the full year, in a strongbox type case 16mm thick and 43mm diameter all in titanium. It was available in either titanium or stainless steel, and with the dial markings done.