The IWC Portugieser Perpetual Calendar IW503404 is a luxurious expression of Swiss watchmaking mastery. Its 44.2 mm red gold case houses a slate-grey dial with a full perpetual calendar, including day, date, month, four-digit year, and a dual moon-phase display for both hemispheres. Powered by the Calibre 52615 with a 7-day power reserve, the watch combines precision with elegance. A black Santoni alligator strap completes the look, making this timepiece a refined companion for those who appreciate technical sophistication and timeless style.