Short answer: the replica IW371484 is a Chinese-made copy of the IWC Portugieser Chronograph. Expect a 41mm steel case, a bi-compax dial with small seconds at 6 and a 30 minute counter at 12, and an automatic movement built on the Valjoux 7750 family. Cheap versions sell for under $100. The better tiers start near $350. None of them are the real watch, and importing one into the United States is against federal law.
What the real IW371484 is
The IW371484 sits inside the Portugieser Chronograph line, and that matters because the entire replica market for it is organized around one problem: the dial layout. Published specs for the family list a 41mm steel case, about 13mm thick, 20mm lugs, and 3 bar of water resistance. The movement is IWC's own caliber 69355, a column wheel chronograph rated at 46 hours of power reserve. Running seconds sit at 6, the elapsed minutes counter sits at 12, and the dial carries thin leaf hands over applied numerals.
Reference listings differ on dial finish and strap, so match the exact variant against IWC's own catalog before you compare anything. If the photos you are working from do not agree on the dial, every comparison after that is guesswork.
How the copies are built
- Base tier. Quartz or a rough automatic, wrong case thickness, printed subdial rings, mineral glass.
- Mid tier. A7750 automatic, sapphire crystal, passable case polishing. Subdial spacing is usually a hair off and the rotor engraving gives it away.
- Top tier. Decorated clone or modified 7750, AR coated sapphire front and back, correct 20mm lugs, often a better strap. This is the tier sellers mean when they say super clone.
What I would inspect first
- Case thickness. The 7750 family runs tall. If the case reads 14mm or more, the profile is wrong.
- Subdial positions. Check where the small seconds hand sits relative to the 6 marker and whether the 12 counter is centered.
- Pusher feel. A column wheel movement is crisp and light. Most copies are mushy, and you feel that in ten seconds of use.
- Crystal. IWC uses double AR coating, so the glass almost disappears with a faint blue cast at angles. Cheap copies look grey.
- Caseback and rotor. Engraving fonts are where replica factories get lazy. Compare letter spacing, not just the words.
- Strap and buckle. Often the weakest part of the package and the easiest thing to swap.
Price tiers, roughly
Spend under $120 and you get a watch that photographs fine and feels like a toy. The $200 to $300 band buys a real automatic and decent finishing, with shortcuts in the caseback and hands. Above $400 you are paying for a cloned movement, better steel, and a strap that does not stiffen after a week. Every tier uses the same reference number in the listing, so price and photos are the only signal you get.
The part most guides skip
In the US, 19 U.S.C. 1526 makes importing merchandise with a counterfeit mark unlawful, and CBP seizes watches at the border on a regular basis. Personal use is not a defense. Beyond the legal exposure, a replica carries no warranty, no service from IWC, no parts support, and no resale value. You also cannot legally sell it later. If what you want is the look, a legitimate homage or a used watch from another brand does the same job without the paperwork risk.
Bottom line
The replica IW371484 is a costume piece of the Portugieser Chronograph. If you are studying one out of curiosity, focus on case thickness, subdial placement, and pusher feel, because those are the three things a photo cannot fake and a wrist notices right away. If you are buying to wear and pass off as genuine, understand the customs risk and the fact that it will never be serviceable or sellable.