Portuguese Perpetual Calendar reference 5023 The moon phase display on the Portuguese Perpetual Calendar, Reference 5023, is a grand-scale theatre on a tiny stage. In other respects, this elegant, up-to-the-minute timepiece leaves virtually no wish unfulfilled: perpetual calendar, four-digit year display, seven-day automatic movement with Pellaton winding system and a power reserve display. http://www.iwc.com/en/collection/portuguese/IW5023/

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