The short answer

"Fake IW938402" is a search phrase, not a watch model. The six digits after IW do not line up with any reference in IWC's published catalog. IWC's real families run in recognizable blocks: 3716 for the Portugieser Chronograph, 3777 for the Pilot's Chronograph, 5007 for the Portugieser Automatic. Nothing in the 93xxxx range shows up. So when a listing says "IW938402 replica," the number is either a factory batch code, an invented string built to dodge brand-name filters on marketplaces, or a typo someone copied from another listing. It tells you nothing about what you're buying. The photos and the spec sheet do.

Why the reference number still matters

Reference numbers are how the replica trade organizes itself. Good sellers list the real IWC reference, the case diameter, the movement inside, and the factory. Weak sellers list a number nobody can trace and hide behind watermarked stock photos. A number that doesn't exist in the original catalog is a signal to slow down, not a deal.

There's a second reason to care. Because counterfeit listings get pulled fast, sellers rotate fake codes to stay live longer. That means an invented reference can disappear in a week, and with it any chance of finding the same batch again if the watch turns out badly.

What to check on the watch itself

Ignore the number and look at the object. On an IWC-style piece, these are the tells that matter:

• Case diameter to the millimeter. A real Portugieser Chronograph is 41mm. If the listing says 40mm or 42mm, the case is a generic shell.
• Dial printing. Look at the "IWC" and "SCHAFFHAUSEN" text under magnification. Genuine dials have crisp, evenly spaced serif letters. Cheap replicas smear or crowd them.
• Date wheel font. This is where most sub-$200 replicas fail. The numerals should match the dial font weight, not look like a printer default.
• Movement. Ask directly. A Miyota or Seiko automatic is honest and serviceable. A "Swiss movement" claim at $150 is not.
• Caseback engraving. Depth and sharpness of the reference engraving separate the top tier from the rest.
• Weight in grams. Solid stainless steel cases land in a predictable range. Hollow-feeling cases are a giveaway before you ever see the dial.

The price tiers, roughly

Under about $150 you get a plated case, a basic quartz or low-grade automatic, and visible dial shortcuts. From $200 to $400 the case is usually solid steel, the movement is a proven Japanese automatic, and the bracelet has real solid links. Above that you're in the territory where sellers claim cloned movements and matched dimensions, and where the honest ones will send you a video of the actual watch on a scale and a caliper. Any seller who won't do that at the top tier is asking you to gamble.

Red flags worth walking away from

Unverifiable reference numbers. Photos that are clearly press images with the branding scrubbed. Prices that undercut the rest of the market by half. Sellers who answer "what movement is in it?" with "high quality." And any listing that promises original box and papers on a counterfeit, because that paperwork is fabricated too.

One practical note

Counterfeit watches are illegal to import into the United States and are subject to seizure by customs. That's a real risk on the buyer's side, not just the seller's. Know what you're taking on before you order, and don't treat a tracking number as a guarantee.