Accurate Moonphase For 45 Million Years: IWC Portugieser Eternal Calendar

ATimelyPerspective

(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… The post Accurate Moonphase For 4...
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