A fake IW545125 is a replica of an IWC Portuguese hand-wound model, and the fastest way to sort a good build from a bad one is the movement, not the logo. If the watch in front of you is running a 40-hour Chinese clone with a small seconds hand parked at 9 o'clock, it is an entry-level case dressed up as something serious. I look at four things first: how long it runs on a full wind, how crisp the dial printing is under a loupe, how the sapphire behaves at the edges, and how deep the caseback engraving cuts.
One caveat before the details. Sellers throw reference numbers around loosely, and plenty of listings tagged IW545125 are just Portuguese-styled watches with a vaguely similar dial. Treat the number as a description of a look, not as a guarantee that the watch matches a specific catalogue entry. The last two digits in an IWC reference usually point to a case and dial variant, so the base number matters more than the suffix when you are comparing specs.
Why the movement gives it away first
The Portuguese line has always leaned on pocket-watch DNA: a large case, a thin bezel, a clean dial, and in the hand-wound versions a small seconds subdial. Several references in this family carry a long power reserve, which is exactly the sort of thing a cheap clone cannot fake. A standard 6497 or 6498 derivative runs roughly 40 to 45 hours at 3 Hz. Wind it fully, set it down, and check it at the 48-hour mark. If it is dead, the marketing copy was fiction.
Ask for a timegrapher video. Rate, amplitude and beat error tell you more in ten seconds than a hundred macro photos. Ask for the movement shot with the caseback off. Geneva stripes should be cut, not printed, and the screws should be blued steel rather than paint.
Dial and case details worth a zoom
Dial quality is a printing contest.
- Railway-track minute ring: the ticks should be evenly spaced with clean inner and outer boundaries. Blurred or merged lines mean cheap pad printing.
- Numerals: applied numerals should show faceted edges and a shadow line. Printed ones look flat from every angle.
- Hands: leaf-shaped hands should taper to a sharp point. A thick blunt tip is a giveaway at arm's length.
- Subdial: it should sit slightly recessed with its own circular finishing, not glued flat to the main dial.
On the case, run a fingernail along the lug bevels. They should feel like a defined edge, not a soft roll. Check that the brushed flanks and polished bezel meet on a clean line, and that the crown has crisp knurling with a legible logo.
Crystal, caseback and the feel in hand
Look at the sapphire from a low angle. A domed crystal should bend the light near the edges and stay clear in the middle, with anti-reflective coating on the inside only. Coating on the outside scratches, and it makes the dial look faintly blue under indoor light.
Flip it over. Engraving depth is the tell. Laser etching looks grey and shallow. Proper engraving has visible walls. On display-back versions, check that the balance cock engraving is sharp and the rotor, if there is one, is finished on both sides.
Then weigh it. A 42 to 44mm steel Portuguese case with a leather strap should feel substantial, roughly in the 80 to 100 gram range depending on the build. If it feels like an empty tin, the case is thin-walled.
Strap, clasp and the small stuff
Most sellers photograph the dial and hide the strap. Ask directly. Leather should be firm, evenly stitched, and the same thickness front to back. Folding clasps should snap with a solid click and carry sharp engraving inside. A flimsy clasp with a printed logo tells you what the rest of the watch is like.
What to ask before you pay
- Natural light photos, no filters, of the dial, crown to crown, and the caseback.
- A video of you winding it and the seconds hand sweeping.
- Timegrapher readout with rate and amplitude.
- Calipers on case diameter, thickness and lug-to-lug.
- A clear statement on power reserve and what movement is inside.
- Real photos of the exact unit you will receive, not stock images.
Any seller who dodges a caliper photo or sends studio renders only is telling you something. The honest ones send a shaky phone video of the watch on a kitchen table, and that is exactly the video you want.
Bottom line: with a fake IW545125, the movement and the printing decide the price bracket. Nail the power reserve, the subdial depth and the engraving, and the watch holds up on the wrist. Skip those checks and you are buying a photo.