Reference IW503404 Portuguese | A pink gold automatic perpetual calendar wristwatch with moon phases and 7 day power reserve indication, Circa 2015 | Fine Watches | 2023 | Sotheby's
IWC Watches on X: "Rise with the sun, live by the moon. Our star-studded Portugieser Perpetual Calendar (Ref. IW503404) diverges by just 1 day in 577.5 years from the actual phase of