Short answer

IW545190 fits IWC's reference format: the letters IW, then six digits. The block 5451 points to one case family. IWC's public catalog pages do not show IW545190 as a current model. Most pages that carry this full code are replica listings, resale listings, or forum posts. Treat the code as unverified until a seller shows a serial number, a matching warranty card, and photos of the movement.

How IWC reference numbers work

IWC builds a reference from a case family plus a suffix. IW5451 is the family code. The last two digits mark the variant: dial color, strap, or market. IWC stamps the reference and the case number on the caseback. The warranty card repeats both. A genuine watch has two records that agree. A fake often shows a caseback stamp that does not match the card, or a card with a number no IWC service record covers.

Checks on the watch

  • Caseback engraving: depth is even, letters are sharp. Laser print looks flat and gray.
  • Reference and serial: seven to eight digits, no gaps, same font as the rest of the text.
  • Dial print: "IWC" and "SCHAFFHAUSEN" hold crisp edges at 10x magnification. Fake dials show ink spread.
  • Movement: IWC automatics use a rotor with the Probus Scafusia medallion and Geneva stripes. Movement photos are the strongest test.
  • Weight and finish: steel cases sit near the gram weight published for the model. Replica cases use lower-grade steel and lighter rotors.
  • Crystal: sapphire with anti-reflective coating on both faces on most references. Mineral glass scratches and casts blue or purple at an angle.

Price and paperwork

Used IWC steel watches with an in-house movement sell in the four-figure to five-figure USD range. A listing at 5 to 10 percent of that figure is a replica. Ask for the invoice, the service booklet, and the purchase date. IWC service centers in Schaffhausen and New York can confirm a serial number and a service history. No seller who refuses a serial check is offering a genuine watch.

What this guide cannot confirm

No public source checked for this page confirms the model, case size, or movement tied to IW545190. Ask IWC customer service or an authorized dealer for the model record before you send money. Verification of one reference does not carry to another code.