A fake IW545173 is a counterfeit watch built to imitate an IWC reference number. The IW prefix belongs to IWC Schaffhausen, so a watch carrying that reference was designed and produced by the brand. Anything sold as an IW545173 that did not come from IWC is an unauthorized copy, no matter how close it looks in photos. Knowing which details the brand controls makes a fake IW545173 easier to separate from the real thing.

What the reference number actually tells you

IWC builds its references from a fixed structure: the IW prefix, four digits for the model family, and sometimes two more digits that pin down the case material, dial, or movement variant. IW545173 therefore points to one specific configuration inside the brand catalog, not a generic model name. Copyists reuse the exact string because search engines and marketplaces surface it, which is why listings for a fake IW545173 appear alongside genuine ones. The number itself is brand property, not a public model code.

Why replicas of this reference exist

Hand-wound IWC watches attract collectors, and popular references get copied. Counterfeiters favor references with clean dials and simple cases because industrial tooling can reproduce those shapes at low cost. The output is a watch that photographs well and shows its flaws once you look through a loupe.

What gives a fake IW545173 away

Movement and winding feel

A genuine hand-wound IWC movement winds with resistance that builds in a smooth arc, and the crown returns a defined click at each turn. Copy movements can feel gritty or loose, and the power reserve often falls short of the stated figure. If the caseback has a sapphire window, inspect the finish on the bridges and the engraving. Stamped lettering, uneven bevels, and inconsistent Geneva stripes point to a third-party movement.

Case, lugs, and surface finishing

Look at the joints. Genuine cases hold crisp edges, consistent brushing direction, and polished bevels that stay sharp under magnification. Fakes show rounded edges from over-polishing, brush grains that run the wrong way, and spring bars that do not sit flush inside the lugs.

Dial, hands, and printing

Printing is where most copies fail. Genuine dial text is applied with even spacing and consistent stroke thickness. On a fake, letters crowd together, the font sits a fraction off, and lume plots drift away from the marker centers. Hands should match the catalog length and shape, and they should line up with the markers when the time is set.

Caseback, serial, and reference stamps

Reference and serial numbers are stamped or engraved into the metal, not printed on a flat plate. Check that the caseback number matches the movement number and any documentation that comes with the watch. A mismatch between those numbers is one of the clearest signs of a fake IW545173.

Box, papers, and service history

Boxes, booklets, and warranty cards are simple to print, so treat them as supporting evidence rather than proof. A service invoice from an authorized workshop carries more weight than a filled-in card.

How to verify a watch before you pay

• Request macro photos of the dial, caseback, crown, and movement in natural light.
• Compare the reference against the brand catalog listing for that exact number.
• Have a watchmaker who services the brand open the case and inspect the movement.
• Confirm the serial with the brand customer service before money changes hands.
• Buy from a seller who offers a return window and states authenticity in writing.

Risks that come with a counterfeit IWC

Counterfeit watches have no manufacturer support. Authorized workshops do not service them, spare parts are not available through official channels, and water resistance claims cannot be trusted. Resale is hard because auction houses and reputable dealers refuse them outright. Customs authorities in many countries seize counterfeit goods at the border, and importing or reselling them can carry civil and criminal penalties. Paying close to retail for a copy means paying a real price for a watch with no ownership support.

Bottom line

The reference IW545173 is an identifier IWC controls, and a watch sold under it that did not come from the brand is a counterfeit. Check the movement, the case finishing, the dial printing, and the serial alignment before you commit, and use the brand or a qualified watchmaker to confirm authenticity. Those steps answer the question faster than any listing photo.