Quick answer
The replica IW545190 is worth buying only if the dial and the case profile are right. Everything else can be fixed or lived with. Most cheap versions get the logo and the hands roughly correct, then ruin it with a case that sits a millimeter or two too thick and a subdial that crowds the printing at six o'clock. If you compare a photo of the copy to a photo of the genuine hand-wound Portuguese at the same angle and the proportions still hold up, you are looking at a decent piece.
One warning before anything else: sellers reuse the "IW545190" string across several dial colors and case finishes. Confirm which variant you are being shown against IWC's own catalog first, otherwise you will spend an evening comparing two different watches.
What the reference actually is
The IW545190 belongs to IWC's Portuguese family, a hand-wound watch with a small seconds subdial at six, a slim bezel, applied numerals, and feuille hands. It reads as a dress watch but wears larger than the number on paper suggests because the dial is mostly open space. That openness is exactly why replicas struggle. There is nowhere to hide a sloppy index or a soft-printed minute track.
What good copies get right
- Dial printing. Sharp minute hash marks, evenly weighted numerals, and a logo that sits centered above the subdial. Look at the gap between the "IWC" lettering and the twelve index.
- Subdial placement. The small seconds ring should sit low, with breathing room above it. A raised or oversized ring is the first thing I notice on a weak copy.
- Hand shape. Feuille hands should taper to a fine point. Blunt tips with visible flat edges look wrong from arm's length.
- Case profile. The lugs should curve down toward the wrist rather than sit flat. Compare side-on shots, not just face-on.
- Crystal clarity. A slight dome with no milky edge. Cheap sapphire often has a greenish tint at the rim.
Where replicas fall short
Movements. Genuine hand-wound IWC calibers are finished and regulated to a standard that copies do not approach, and many replica versions use an automatic movement with a fake hand-wound feel, or a basic Asian hand-wound that winds with a gritty resistance. You will notice this every morning when you wind it. Case thickness follows from the movement choice, so a thick case is usually a tell about what is inside.
Also expect compromises on the strap, the crown engraving, and the caseback text. None of these are deal-breakers at the price, but they are the first things an owner notices after a month.
Checks before you pay
- Ask for a side-on photo and a wrist shot. Proportions show up there.
- Ask for a macro of the dial at six o'clock. You want clean printing, not fuzzy edges.
- Confirm whether the movement is hand-wound and how the winding feels.
- Ask about water resistance and treat any claim above splash resistance with suspicion.
- Check the return window. If there is none, walk away.
Sizing and daily wear
The Portuguese case is not small, so wrist size matters more than with a 38mm dress watch. Anything under about 6.5 inches of wrist and the lugs start to overhang. Swap the stock strap for a thinner leather one if the case already sits tall, and keep the original for resale photos. A replica is not an investment, so buy it to wear.