NEWS
IWC Portugieser Eternal Calendar watch.

(This article by Roberta Naas first appeared on Forbes.com.) At Watches & Wonders Geneva this past week, IWC Schaffhausen unveils a world’s first perpetual calendar watch that the brand says boasts a moon-phase indicator that accurately tracks the celestial body for 45 million years. The Portugieser Eternal Calendar also incorporates a 400-year gear system to…