A fake IW329088 gives itself away at the caseback, the date window, and the movement. The genuine watch belongs to the IWC Portugieser Automatic 40 family and runs the in-house calibre 82200 with Pellaton winding, a 60-hour power reserve, and a steel case of 40.4 mm at roughly 10.5 mm thick. Most counterfeits of this reference build on a generic automatic base, so the dimensions, the engraved calibre number, and the finishing never line up all at once.
What you need before you start
- A 10x jeweler's loupe
- Digital calipers that read to 0.01 mm
- Raking light from a desk lamp, plus daylight
- Catalogue photos of the reference, saved offline
Step-by-step inspection
- Measure the case across the bezel on the 2 to 8 o'clock line, then from caseback to crystal; a genuine Portugieser Automatic 40 reads 40.4 mm and close to 10.5 mm.
- Set the watch dial up under the loupe and read the "IWC SCHAFFHAUSEN" signature for sharp serifs and even letter spacing.
- Study the applied indices and leaf hands for faceted edges and polished bevels that catch light in one continuous line.
- Inspect the date aperture for a machined bevel around the opening and a date disc whose numerals sit square to the frame.
- Turn the watch over and check the display back for a sapphire crystal with a faint blue anti-reflective tint and no mold seam at the edge.
- Read the rotor and bridges through the back for the engraved calibre number 82200, an even Côtes de Genève or circular graining pattern, and a signed rotor.
- Wind the crown twenty turns and feel for smooth resistance; Pellaton winding works in both directions, so the rotor should swing freely with a light shake.
- Compare the serial and reference numbers on the caseback with the numbers on the warranty card and any IWC service record.
Where most fakes fail
Counterfeit cases often run one to two millimeters thicker than the genuine article to house a stock movement, which pushes the caseback away from the wrist and throws off the lug profile. The dial is the second weak point: the signature thickens, the minute track drifts out of register with the indices, and the printed date numerals come out wide and shallow behind a flat window. Under the display back, laser marking on the rotor reads gray and shallow instead of cut into the metal, and the bridge finishing shows machine repetition rather than hand application.
- Oversized case height and blunt lug bevels
- Blurred or bold dial print with uneven track spacing
- Date disc set deep behind the dial with a soft numeral font
- Shallow rotor engraving and a missing calibre number
- Stamped crown engraving and gritty thread feel
Red flags in the sale itself
- A price well under the going rate for a steel Portugieser Automatic 40
- Stock catalogue photos instead of daylight shots of the actual watch
- A seller who cannot name the calibre or supply a clear caseback photo
- Box and papers with mismatched reference numbers or the wrong card stock
- Pressure to pay by wire or crypto with no inspection window
If you already own one
Take the watch to an authorized dealer or a watchmaker with brand training and ask for a movement identification and a timing check. A watchmaker confirms the calibre in minutes, and the service quote that follows settles the question. Sellers who describe a watch as a replica should price it as a replica; a counterfeit sold as genuine is fraud, and the serial record is what proves it.