A fake Portugieser 42mm is a counterfeit of the IWC Portugieser Automatic, a 42.3 mm watch with a seven-day power reserve. The genuine version runs IWC calibre 52010 with applied dial markers and a sapphire display back, while copies typically hide a generic automatic movement behind a decorated plate. Reference numbers and measurements separate the two faster than any photo comparison.

Which IWC model is the 42mm Portugieser?

The 42 mm size belongs to the Portugieser Automatic family, references IW5007 and its predecessors in the 5000 series, measured at 42.3 mm across. IWC sizes the Portugieser Chronograph at 41 mm and the Portugieser Automatic 40 at 40.4 mm, so a listing that advertises a 42 mm Portugieser points to the Automatic. That detail matters because the Automatic has a distinct layout: small seconds at 9 o'clock and a power reserve indicator at 3 o'clock.

How can you tell a fake Portugieser 42mm?

Fakes fail on proportions, dial finishing, and mechanics rather than on the logo alone. Work through the four checks below in order, since the later ones are the hardest to imitate.

Case and proportions

A 42.3 mm case should sit about 14.2 mm thick with slim, curved lugs and a polished bezel. Copies often run a full millimeter thicker and use lugs that look flat from the side. Case weight is a quick signal, because a steel Portugieser Automatic feels dense on the wrist rather than hollow.

Dial and printing

Genuine dials use applied numerals and indices with crisp, faceted edges and even finish. On copies the numerals tend to be stamped and glued, so they sit flat and cast almost no shadow. Check the printing under magnification: "IWC" and "SCHAFFHAUSEN" should be razor sharp, correctly spaced, and free of double lines.

Movement and power reserve

Calibre 52010 uses Pellaton winding, two barrels, and ceramic components to reach a seven-day reserve. A fake will not hold a week of charge, and its rotor spins loosely and loudly. If the seller cannot show the movement through a display back, treat that as a warning.

Caseback, engraving, and strap

Reference and serial numbers on the genuine caseback are cut with clean edges and match IWC records. Copies show shallow, uneven engraving and numbers that no service center can trace. Strap hardware is another tell, since genuine IWC buckles are signed and precisely finished.

Quick checklist for a 42mm Portugieser

• Case measures 42.3 mm wide and roughly 14.2 mm thick.
• Small seconds at 9 o'clock, power reserve at 3 o'clock.
• Applied, faceted numerals with sharp edges.
• Seven-day power reserve that actually works.
• Traceable reference and serial numbers on the caseback.

What should you do if you bought a fake?

Stop wearing the watch and gather the listing, payment record, and photos. An IWC authorized dealer or service center can confirm authenticity in writing, which most payment platforms require for a dispute. Then request a refund and report the seller to the platform and to your local consumer protection office.

Does a 42mm fake keep accurate time?

Some copies keep reasonable time, but accuracy is not the test. Authentication comes down to provenance, finishing, and serviceability, and counterfeits fail all three. A copy cannot be serviced by IWC and holds no resale value.