The IW371480 sits inside the IWC Portugieser Chronograph family, and a fake IW371480 is a counterfeit watch built to imitate that reference. The fastest way to identify one is to check three things in order: the movement, the dial printing, and the case finishing. Counterfeiters copy the outside well, but they rarely match all three.
What the IW371480 reference represents
The Portugieser Chronograph is one of IWC's longest-running designs. References in the IW3714 series share a core architecture: a round stainless steel case, a clean dial with two subdials, a small date window, and a chronograph movement built on the Valjoux 7750 base that IWC reworks as its own calibre. Because the reference numbers sit close together and the visual differences between variants are small, listing photos for one reference get reused for another. That is where confusion starts, and it is also where counterfeits hide.
Before you compare anything, confirm which variant you are looking at. Dial color, hands, strap, and case metal change across the IW3714 group, so a genuine watch in one finish can look wrong next to a listing for a different finish.
Why this reference gets copied so much
- The design is simple. A two-subdial face is easier to print than a busy multi-function dial.
- The silhouette is familiar, so a copy reads as authentic at arm's length.
- Secondhand prices sit in a range that makes a high-margin counterfeit worth producing.
Case and caseback checks
Run your thumb along the lugs and the case flanks. Genuine IWC finishing is even, with crisp edges where brushed surfaces meet polished ones. Copies show rounded lug edges, a soft transition between finishes, or polishing that bleeds onto surfaces that should be brushed.
Turn the watch over. Caseback engraving should be sharp and shallow, with consistent letter spacing, and the reference number should match the variant you are told you are buying. On fakes the lettering is deeper, wider, or uneven, and the same case number shows up on multiple watches from the same seller.
Dial and printing checks
- Printing: study the brand name and the text under it with a loupe. Letters should be solid with clean edges. Fakes show fuzzy edges, uneven stroke width, or lettering that sits off-center.
- Subdials: rings should be concentric with even spacing, and the subdial hands should reach the track markers.
- Date window: centered, cleanly cut, with the date sitting square in the aperture.
- Hands: shape and length should match the exact variant. Second-hand length is a common giveaway.
Movement checks
This is the decisive test. The Portugieser Chronograph runs an IWC-modified chronograph movement, and the chronograph action feels different from a stock copy. The pushers have a defined, firm travel and reset to zero every time. A stuttering reset, a pusher that feels hollow, or a seconds hand that does not snap back points to a counterfeit.
If the watch has a display back, inspect the rotor engraving, perlage, and bridge shapes. If the back is solid, run the chronograph for a few hours and check the timekeeping. A cheap copy drifts.
Price, box, and paperwork
Price is the loudest signal. When a stainless steel Portugieser Chronograph is listed far below the range shown by established dealers and auction results for that reference, assume something is wrong until proven otherwise. A watch, box, and papers bundle at a fraction of market value is not a bargain.
Paperwork checks matter too. Match the reference and case numbers on the warranty card or service slip against the numbers on the caseback. They should agree exactly.
What "first copy" and "fake" mean in listings
Sellers use terms like first copy, mirror quality, and AAA grade to describe replica tiers. Those words describe build quality, not authenticity. A first copy watch is still a counterfeit: it was not made by IWC, it is not covered by IWC service, and it cannot be sold as genuine. Trafficking in counterfeit goods is illegal in the United States, and anyone passing a replica off as genuine is committing fraud.
If you want the look of the Portugieser Chronograph and you accept that you are buying a replica, buy with clear expectations: a generic movement, a shorter service life, and no resale value. If a seller claims the movement is genuine IWC, walk away.
Getting a second opinion
If you are paying anything close to genuine market price, pay for an authentication check from a qualified watchmaker or a pre-owned dealer before money changes hands. A watchmaker can open the case and confirm the movement in minutes, which beats any photo comparison.
Quick checklist
- Confirm the exact variant and reference number.
- Inspect case finishing at the lug edges and finish transitions.
- Loupe the dial printing, subdial rings, and date window.
- Test chronograph start, stop, and reset several times.
- Match caseback numbers to the paperwork.
- Compare the price against dealer listings for the same reference.