A fake IW329115 usually fails in three places: the movement you can see through the caseback, the case thickness and profile, and the dial furniture. A genuine IWC Portugieser from the IW3291 family carries an in-house calibre with Pellaton winding, a slim polished case, and applied indices, while most replicas substitute a decorated third-party movement inside a noticeably thicker case.
Start with the reference, not the watch
IWC reference numbers in this family run through the IW3291xx range, so a listing shown as "IW329115" deserves a character-by-character check against IWC's own catalog page before you compare anything else. Replica listings routinely shuffle or invent suffixes, and a wrong suffix means every other comparison is being made against the wrong watch. Confirm case material, dial color, strap type, and whether a small seconds subdial belongs at 6 o'clock for that specific reference.
Our pick first: authenticate, then choose a path
If you are comparing a fake to a real one because you are about to spend money, the first pick is the safe one: buy only from a source that can show the movement, the reference engraving, and the paperwork together. Everything else is a compromise you should make with open eyes.
- Authorized dealer or boutique. Full warranty, confirmed reference, no ambiguity. The most expensive option and the only one with zero authentication risk.
- Reputable pre-owned dealer. Ask for macro photos of the caseback engraving and the movement, plus service history. A genuine watch with a service record is a better buy than a perfect-looking box with no history.
- A different reference or a legitimate homage. If the budget is the real constraint, a well-made homage from an established brand gets you the look without the legal and resale problems that come with counterfeits.
Fake vs real: the checks that actually work
- Case thickness. Replicas tend to run thicker because the substituted movement needs more room. A watch that sits tall and top-heavy next to photos of the genuine profile is a warning sign.
- Movement finish. Look at the bridges and rotor under a loupe. Genuine finishing is even and deliberate; replica finishing is often stamped or applied as a decorative plate over a different base calibre.
- Rotor engraving. Lettering should be crisp, correctly spaced, and consistent in depth. Fuzzy or shallow engraving is common on replicas.
- Dial furniture. Applied indices sit proud with clean edges and polished facets. Printed or poorly seated markers show a flat edge and uneven reflection.
- Subdial execution. The small seconds track should be finely finished, with hands that reach the correct point on the track.
- Caseback engraving. Reference and serial numbers are cut deeply and cleanly on genuine watches; laser-etched replica text often looks lighter and shallower.
- Crystal and coatings. Genuine sapphire with anti-reflective treatment reads almost invisible at an angle. Cheap coatings show a blue or purple tint.
- Weight and balance. Hold it in the palm. A genuine steel watch of this size has a particular heft that thin replica cases rarely match.
The movement is the hardest thing to fake
The Portugieser Automatic 40 uses IWC's calibre 82200 with Pellaton winding and roughly a 60-hour power reserve. That architecture, including the ceramic components in the winding system, is not something a replica factory reproduces. Open the caseback and look for the shape of the bridges, the direction of the winding, and the quality of the perlage and Geneva stripes. A movement that looks busy but resolves into flat, stamped detail under magnification is the single most reliable tell.
Case, dial, and printing details
On the genuine watch, the leaf-shaped hands are faceted and polished, and the printing on the dial, including the brand signature and the "Probus Scafusia" text, is sharp enough to read cleanly at arm's length. Replica printing often looks slightly heavy or slightly blurred at the edges. The Automatic 40 also has no date window, so a replica that adds one has given itself away immediately.
Price and paperwork sanity check
A price far below the going pre-owned rate is the oldest signal there is, and paperwork is easy to counterfeit. Boxes, manuals, and warranty cards prove far less than a movement photo and a documented service history. Note also that importing counterfeit goods is illegal in the United States and shipments are subject to seizure, which is a real cost that never appears in the listing price.
Bottom line
Compare the movement first, the case profile second, and the dial last. If any of the three is off, stop there. A real IW3291 reference from a documented source is the pick, a vetted pre-owned example is the sensible option, and a legitimate homage is the honest fallback when the budget will not stretch.