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The IW504402 is a limited-edition Portugieser (250 pieces in 18k rose gold) built around IWC's in-house calibre 51900. It pairs a flying minute tourbillon with a retrograde date and a seven-day power reserve, all in a 44.2mm rose gold case with a silver-plated dial. It suits collectors who want a high-complication dress watch with real horological content rather than a simple three-hander. Against the standard Portugieser Automatic it is far more complex and far more limited, but also much larger and heavier on the wrist, and the tourbillon and retrograde layout make it a display piece rather than an everyday watch.
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Owners and reviewers treat the Tourbillon Mystère Rétrograde as a collector's Portugieser: they praise the finishing of the calibre 51900, the flying tourbillon and the seven-day reserve, and note the rose gold case feels substantial. The main reservations are its size and weight on smaller wrists and the cost of servicing a high complication.
The IWC Portugieser Tourbillon Mystère Rétrograde, model IW504402, is a mechanical watch in an 18k rose gold case with a transparent case back. It has a silver-plated dial and a convex sapphire crystal with anti-reflective coating on both sides.
It features a flying minute tourbillon and a retrograde date display. The movement is the IWC-manufactured calibre 51900 with Pellaton automatic winding, 44 jewels and a 7-day power reserve.
The watch comes on a dark brown leather strap with a deployant buckle. It is a limited edition of 250 watches in 18k rose gold.
