Short answer
"Fake IW371613" is a search phrase, not a product name. IW371613 is an IWC reference number in the Portugieser Chronograph family. Sellers who move copies of that watch use substitute terms, because a listing title that carries the IWC name draws takedowns. The common substitutes are "rep", "super clone", "1:1", "mirror", the bare number "371613", and the split form "IW3716-13". None of these words is a grade standard. They are listing habits.
What IW371613 refers to
IWC reference numbers run as IW, then four digits, then two more. The IW3716 block is the Portugieser Chronograph. That block covers two generations: an older case at 40.9 mm that used caliber 79350, a modified Valjoux 7750, and the 2020 generation at 41 mm with the in-house caliber 69355. Public spec data for older IW3716 numbers is thin. Treat any spec sheet on a resale or replica listing as unverified until an authorized dealer confirms dial color, case metal, and movement.
Synonym list sellers use
- 371613, IW 371613, IW3716-13, IW3716 13
- "Port chrono" and "Portugieser chrono"
- rep, replica, clone, "super clone", "mirror", "1:1", "AAA", "grade A"
- "homage", "tribute", "style": lookalikes from other brands, with no IWC markings
- "fantasy": a dial or case mix that never existed in the original catalog
- "QC pics", "factory": forum slang for pre-shipment photos and the workshop that built the watch
How the terms map to listings
A title such as "IW3716-13 super clone 1:1" carries three separate claims. The number says which watch is being copied. "Super clone" says the seller wants a higher price than a plain replica. "1:1" says the copy matches the original in size. None of the three claims is testable from a photo. Forum usage treats "super clone" as a tier above "AAA", but no factory publishes tolerances, so the label tracks price, not measured accuracy.
Signals that a listing is a copy
- Price far below the secondary market for a steel Portugieser Chronograph
- Stock photos with blurred casebacks or covered serials
- Dial text with uneven spacing or thin printing
- Subdial hands that sit at the wrong length
- "In stock, ships in 24 hours" on a reference that dealers order
Legal position in the US
Trafficking in counterfeit goods carries criminal penalties under 18 U.S.C. 2320. CBP seizes counterfeit watches at ports of entry. Import and resale carry the exposure. A single personal purchase is a separate question from running stock.
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What to check instead
For a genuine watch, check the reference and serial engraving between the lugs, the caseback markings, the movement finish, and the depth of the dial printing. Papers and box should match the production year. IWC service can authenticate a watch for a fee. That is the step that settles the question.