
IWC’s Portugieser Eternal Calendar Moon Phase watch is precise for 45 million years
At Watches and Wonders Geneva, which started Tuesday, IWC Schaffhausen unveils a world’s first perpetual calendar watch. The brand says it 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 account for leap years and skipped leap years for […]