The story behind this IWC Portugieser Perpetual Calendar
IWC presents the Portugieser Perpetual Calendar model IW503404. This timepiece follows in the tradition of the maritime observation watches created in the late 1930s to meet the precision requirements of navigators. The perpetual calendar featured in this model is based on a mechanical innovation. In the 1980s, master watchmaker Kurt Klaus devised a complex calendar that was nevertheless remarkably simple to use. All the displays are synchronised. A simple turn of the crown advances the date, day, month, year and moon phase simultaneously. This approach defines IWC’s vision of fine watchmaking.
Case, calibre and strap of this Portugieser
The 18-carat red gold case measures 44.2 mm in diameter and is 14.9 mm thick. It features alternating horizontally brushed sides and a mirror-polished bezel. The sunburst slate-coloured dial offers visual depth thanks to its four blued sub-dials. Applied red gold Arabic numerals mark the hours. This dial features a full perpetual calendar with a four-digit year display and a dual moon phase indicating the northern and southern hemispheres. The transparent sapphire crystal case back reveals the self-winding IWC Calibre 52615. This movement, equipped with the Pellaton system, incorporates black ceramic components to minimise wear. It features two barrels providing a power reserve of 168 hours and operates at a frequency of 4 Hz. The black alligator leather strap, manufactured by Santoni, fastens with an 18-carat red gold folding clasp. The watch is water-resistant to 30 metres.
Why this IWC watch
This Portugieser stands out for the balance between the red gold and the understated slate-grey dial. Kurt Klaus’s perpetual calendar remains a complication much prized by enthusiasts of mechanical watchmaking. On the second-hand market, acquiring a timepiece of this technical calibre provides access to one of the Schaffhausen-based manufacturer’s flagship models, at a price adjusted in relation to the current catalogue.
Contents supplied and condition
This watch is supplied complete with its kraft paper outer box, its black grained presentation box, the user manual, the warranty booklet and its original certificate of authenticity. The watch displays a contemporary configuration, with the year window set to 2025. The timepiece is in perfect condition. The factory protective films are still in place on the case back and on the red gold folding clasp. The leather strap shows no signs of wear.
Warranty and delivery
The Swiss Collector guarantees the authenticity of this timepiece. The watch is covered by the manufacturer’s warranty. We accept returns within 10 days in accordance with our terms and conditions. As Switzerland’s leading second-hand retailer, backed by the largest network of boutiques, we offer online booking for a fitting and collection in-store, or fully secure international delivery.
* As new – a new watch, never worn or in exceptional condition. No defects visible to the naked eye.
