IWC Portugieser Eternal Calendar
IW505701
The Portugieser Eternal Calendar extends mechanical calendar watchmaking to a genuinely secular scale. Its movement accounts for the Gregorian calendar’s exceptional leap-year rules, while the eternal moon-phase display is calculated to remain accurate for 45 million years. Framed by a 44.4 mm platinum case, the transparent white dial reveals the architecture beneath without sacrificing the calm symmetry of the Portugieser, and the automatic calibre 52640 sustains the display with a seven-day power reserve.
Reference: IW505701
Movement: Automatic, calibre 52640
Case: Platinum, 44.4 mm
Dial: White
Strap/bracelet: Black alligator leather strap by Santoni
Features: Date; Moon phase; Stop-seconds; Anti-reflective crystal
Water resistance: 50 m / 5 ATM
Year: 2026 — Full set
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