What is a fake IW371780?
A fake IW371780 is a counterfeit copy of the IWC Portugieser chronograph built in the IW3717 reference series. Genuine examples are 41 mm steel chronographs running in-house IWC calibre 69355, a column-wheel movement with roughly 46 hours of power reserve. Counterfeits copy the silhouette from arm's length and then give themselves away under a loupe, on a scale, or with a caseback tool.
How can you tell a fake IW371780 from a genuine IWC?
Check the movement first, the dial second, and the paperwork last. A counterfeit is built to survive a phone photo, not a physical inspection.
Movement and caseback
Through a display back you should see IWC calibre 69355 with clean finishing, properly engraved IWC markings, and a column-wheel chronograph layout. Counterfeits often hide a generic 7750-style movement, or they use a closed caseback so nothing can be seen at all. A qualified watchmaker can confirm the movement in minutes.
Dial, printing, and hands
Genuine Portugieser dials show razor-sharp printed numerals, evenly applied markers, and thin polished feuille hands that sit perfectly aligned at 12. Fakes typically show fuzzy or doubled text, uneven lume, subdial rings that look too thick, and a chronograph sweep hand that will not return to zero. Date windows on counterfeits are often off-center or crowded against the dial edge.
Case, weight, and finishing
A real IWC carries more heft than its size suggests, with crisp bevels, a smooth crown action, and pushers that click without grit. Counterfeits feel light or hollow, and the transition between brushed and polished surfaces looks rounded instead of defined. Softer steel also means a fake scratches faster and shows worn edges within weeks.
Serial numbers, engraving, and packaging
Caseback engraving on a genuine piece is deep, evenly spaced, and matches the reference on the warranty card and papers. Counterfeits usually show shallow laser etching, mismatched serial numbers, and documents with blurry print or the wrong logo proportions. Boxes and manuals are counterfeited separately, so packaging by itself proves nothing about the watch.
What gives a counterfeit IW371780 away fastest?
- The chronograph sweep hand fails to snap back to 12.
- Caseback engraving is shallow and the serial number font looks wrong.
- The rotor is noisy or spins loosely when the watch is tilted.
- Dial printing looks fuzzy or doubled under a loupe.
- Pushers feel spongy instead of crisp.
Where do fake IW371780 watches get sold?
Counterfeits move mostly through social media sellers, pop-up marketplaces, and classified listings that use stock photos and steep discounts. Pre-owned genuine Portugieser chronographs typically trade in the roughly $5,000 to $8,000 range with condition and papers, while copies sell for a few hundred dollars. A price that far below market is the single strongest warning sign.
What should you do if you already bought a fake?
Stop wearing it, keep the messages and payment records, and ask a watchmaker or IWC service center to document the findings in writing. Dispute the charge with your card issuer or payment platform if the listing claimed the watch was genuine. Trafficking in counterfeit goods is a federal offense in the United States, so filing a report with the brand or local police is a reasonable next step.
Can a counterfeit IW371780 ever be worth buying?
No. A fake has no warranty, no service support, and no resale value, and its parts may not even interchange with another copy. Reselling it as genuine also exposes you to legal risk. Buyers who want the Portugieser look on a budget are better served by a legitimate microbrand or a well-documented pre-owned piece.