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Movement tier: unclassified
Medium-large: suits wrists 6.5 in+ (16.5 cm+)
40 mm case. Wears confidently on average to larger wrists. May overhang on slender builds.
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Authentication
The Portugieser 40 is the first fully in-house IWC Portugieser; confirm Cal. 82200 with Pellaton winding through the caseback before purchase.
Known issues in the market
- Earlier Portugieser refs used ETA or JLC base movements; this generation is fully in-house. Ensure the movement architecture matches Cal. 82200.
- Pellaton winding mechanism uses ceramic pawls; this is an IWC-specific architecture not present in ETA or JLC bases.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| caseback | Cal. 82200 Pellaton winding architecture | IWC in-house movement architecture; Pellaton pawl-and-ratchet system visible; movement layout consistent with Cal. 82200 | ETA or JLC base movement architecture; standard rotor winding without Pellaton mechanism |
| dial | Portugieser 40mm dial proportions | Correct minimalist Portugieser dial proportions for 40mm case; applied Arabic numerals; consistent text rendering | Dial proportions from a larger or smaller Portugieser generation; applied indices from a different Portugieser variant |
| case | Anti-magnetic specification | Case consistent with 40mm specification; papers should confirm anti-magnetic 40,000 A/m rating | Case diameter inconsistent with 40mm specification; earlier Portugieser case sold as current generation |
Common legitimate replacements
- Alligator strap is the standard configuration; verify IWC-logo buckle.
- Papers confirming the Cal. 82200 specification and anti-magnetic rating are important for this reference; missing papers should prompt caseback verification.
Expert resources: IWC serial number verification confirms Cal. 82200. WatchUSeek IWC forum for Pellaton winding architecture photography. The in-house status is confirmed by movement architecture, not marketing.
Authentication guide
Last reviewed June 2026
The IW358303 is the 40mm Portugieser Automatic with Cal. 82100 (in-house) and a leather strap. The 40mm version is the more recent, more wearable interpretation of the larger 42mm Portugieser. The Arabic numeral dial with small seconds at 6 is the defining design.





