Short answer
A replica IW545187 is a watch built to look like an IWC reference IW545187. IWC does not make it and does not sell it. Online sellers price these copies from about $150 to $600. The movement sets most of that spread.
IWC reference numbers carry the prefix IW. The digits after the prefix point to a model line, a case size, a dial, and a strap option. Public records for older references are incomplete. Confirm production dates and the original specification with IWC before you compare anything.
What sets the price
- Movement. A Chinese automatic sits at the bottom. A Japanese automatic sits in the middle. A Swiss ETA or Sellita sits at the top.
- Case. 316L steel is standard. Gold plating is thin and wears through at the lugs.
- Dial. Printed text, applied indices, and the finish change the cost.
- Strap. Leather at the low end. A fitted alligator-grain strap with a signed clasp at the top.
What buyers inspect
Case
Measure the diameter with calipers. Compare it to IWC's published number. A one-millimeter difference shows on the wrist. Check the lug width. Check the crown for engraving depth. Check the caseback for a reference stamp in the correct font.
Dial
Use a loupe on the printing. Genuine dials show sharp edges on each letter. Copies show thick edges and filled counters. Compare the date window position against an original photograph. Check that the indices line up with the minute track.
Movement
Copies use three movement families: a Chinese copy, a Japanese automatic, or a Swiss ETA or Sellita. The third group holds a few seconds a day over years. The first two do not. Ask for a photograph of the movement, not the rotor.
Strap and clasp
Check stitch spacing. Check the clasp for a stamped logo rather than a laser etch. Low-cost straps shed dye onto a shirt cuff within weeks.
Legal position in the United States
Counterfeit watches are illegal to import and to sell in the US. Customs can seize a shipment and assess a penalty against the importer. Trademark law lets the brand owner sue for statutory damages. A personal-use purchase carries lower risk than resale, but the item can still be seized.
What a replica cannot do
It cannot hold resale value. It cannot be serviced by IWC. It cannot be authenticated. Replica movements have no parts network beyond the seller.