Short answer

IW545190 turns up in replica listings far more often than in IWC dealer stock. IWC marks its references with the letters IW plus six digits and lists current models on its own site. If a seller cannot point to that listing, an authorized dealer, or a service record for the same number, the watch is a copy. Judge the watch on the case number, the movement, and the paperwork. Do not judge it on the reference typed into the sales page.

Public spec sheets for IW545190 are thin. Treat any list of dimensions or features that appears in a marketplace ad as unverified until you match it against IWC material or a watchmaker's inspection.

Reference number check

Ask the seller for the full reference and the case number. They are two different things. The reference names the model line. The case number is unique to one watch and sits on the caseback.

  • Search the reference on iwc.com and with an authorized dealer.
  • Ask for a photo of the caseback with the numbers in focus.
  • Ask for the warranty card and the date of purchase.
  • Ask which IWC service center handled the last repair.

A genuine owner can answer all four. A replica seller answers one and dodges the rest.

Case and caseback

Genuine IWC casebacks carry deep, sharp engraving. Letters have clean edges. Reference numbers, case numbers, and material stamps sit in fixed positions. Replica engraving looks shallow and soft, and the spacing drifts. Check the caseback screws or the caseback ring. Copies often show tool marks around the slots from assembly in a workshop that does not use IWC tooling.

Weigh the watch. Replica cases run light because the steel is thinner. Measure the case with calipers if you can. A case that misses the stated size by half a millimeter is a warning sign.

Dial and hands

Look at the printing under magnification. Genuine dial text has crisp edges and even spacing. Replica dials show thick strokes, uneven gaps, and blurred logos. Check the applied markers. They should sit flat and level. On copies they tilt or sit high.

Check hand alignment. The hour hand should land on the marker when the minute hand sits at 12. Replica movements often miss this by several minutes.

Movement

Ask for a photo of the movement through the caseback or the display back. Genuine IWC movements carry signed rotors, perlage, and Geneva stripes. Copies use stock movements with glued-on plates. If the seller refuses a movement photo, walk away. A local watchmaker can open the case in minutes and confirm the caliber for a small fee.

Box, papers, and serial records

Genuine IWC watches ship with a box, a warranty card, and a manual. The card carries the reference and case number. Those numbers must match the watch. On replicas the card numbers differ from the caseback, or the card is blank.

Price math

Compare the asking price with sold listings on large marketplaces. A price that sits 70 to 90 percent below the market rate is not a bargain. It is a replica. Nobody sells a real IWC at that gap.

If you already bought one

Stop the payment if you can. File a dispute with the card issuer or the platform. Keep the listing screenshots, the chat log, and the photos the seller sent. Take the watch to a watchmaker and get a written note on the movement and case. That note supports the dispute.