IWC Portugieser Annual Calendar

About This Watch

The IWC Portugieser Annual Calendar IW503501 offers a compelling middle ground between a simple date function and a full perpetual calendar. The annual calendar complication automatically distinguishes between 30-day and 31-day months, requiring manual adjustment only once per year — at the end of February. Powered by the caliber 52850 with its impressive 7-day power reserve from twin barrels, this watch represents IWC's engineering excellence within the Portugieser's elegant framework. The silver dial features subdials for day, month, and the power reserve indicator at 3 o'clock, a date display at 6 with a beautifully detailed moon phase, and running seconds at 9 o'clock. The 44.2mm case size accommodates the multiple indications without feeling cluttered, thanks to careful proportioning and IWC's signature clarity of design. The Pellaton winding system with ceramic components ensures the mainspring is wound efficiently in both directions. While the annual calendar is less complex than a perpetual, many collectors prefer its practicality — a single correction in March is a small price for a watch that is significantly more accessible than its perpetual calendar sibling. The combination of complications, finishing, and value makes this one of the most compelling annual calendar watches in production.