The fast answer: the reference sold as IW389995 does not appear in IWC's published reference lists, so treat any watch bearing that number as unverified until a watchmaker opens it. Searches for fake iw938995 and fake IW389995 lead to the same problem, a caseback engraving that has to be matched against official records before money changes hands.
Why the reference number is the first test
IWC reference numbers follow a fixed pattern, and replica makers often print a number that looks plausible but matches nothing in the catalog. Look up the exact string on the caseback, including the IW prefix and all six digits, then compare it to the model it is being sold as. A mismatch between the number, the dial layout, and the papers is enough to walk away.
How to authenticate an IWC step by step
- Pull the reference from the caseback and confirm it against IWC's official model list for that year.
- Compare the caseback engraving depth and font to catalog photos of the same reference.
- Read the serial number and check that it matches the warranty card and service booklet.
- Measure the case diameter and thickness with calipers and compare to the published specification.
- Inspect dial printing under a 10x loupe: the words Schaffhausen and the index markers should be crisp, level, and evenly spaced.
- Check subdial spacing and hand length against reference photos taken straight on.
- Ask a watchmaker to open the caseback and photograph the movement, rotor engraving, and finishing.
- Test every function, including chronograph start, stop, and reset, and confirm the pushers feel firm with a clean snap.
Replica tells that show up again and again
- Rotor engraving that is laser-etched rather than engraved and filled.
- Caseback screws that sit proud of the surface or use the wrong head shape.
- Subdials that sit too close to the center because the replica uses an off-the-shelf movement.
- Lume that glows a pale green instead of the correct tone, with uneven application at the markers.
- Bracelet end links that rattle or leave a visible gap at the lugs.
If you already bought it
Stop wearing the watch, photograph the caseback, movement, and paperwork, and contact the seller in writing. A watchmaker's report that documents a non-catalog reference number and a third-party movement is the document you need for a chargeback or a dispute. Paying by card or through an escrow service keeps that option open.