The short answer
"Fake IW545104" is search shorthand for a replica of the IWC Portuguese Hand-Wound, reference IW5451. The number itself tells you almost nothing about quality. Two watches sold under the same reference can differ wildly in dial printing, case finishing and movement. What separates a wearable replica from a waste of money is a short list of details you can check with your eyes and a loupe, and a few questions the seller should answer without flinching.
What the reference is meant to be
The Portuguese Hand-Wound is a clean, old-fashioned dress watch: round polished case around 44 mm, thin bezel, small seconds at six, leaf-shaped hands, applied numerals on a lacquered or silvered dial. It winds by hand and has no date. That simplicity is the problem for replica makers. A busy chrono dial hides small errors. A plain three-hander with a subdial has nowhere to hide, so the dial is where you look first.
Three places a replica shows itself
- Dial printing and the subdial. Look at the minute track and the "Portugieser" or "Portuguese" script under twelve. On weak replicas the lettering is too thick, sits slightly off centre, or the subdial ring is printed rather than recessed. The subdial should be a real stepped recess with its own small hand, not a flat disc painted onto the main dial.
- Case profile and lugs. Genuine Portuguese cases are slim and the lugs curve down to meet the strap. Replicas often run a millimetre or two thick and the lugs feel flat and slab-sided. Run a fingernail along the caseband and lug tops. Sharp transitions mean cheap finishing.
- Hands and crystal. Leaf hands should taper to a crisp point with a polished bevel. Painted or stamped hands look blunt under magnification. The crystal on a good example sits close to the bezel and shows little edge distortion.
What good versions get right
The better replicas get the dial proportion right, keep the subdial at the correct distance from the centre, and use a hand-wound movement with a smooth winding feel rather than a gritty one. Crown size and position matter more than people expect on this model, because the crown sits proud of a very thin case. If the crown looks oversized in photos, it will look worse on your wrist.
Caseback engraving is worth a close look. Reference numbers, serials and hallmarks should be crisp and correctly spaced. Fuzzy laser etching is a reliable sign of a low-tier build.
Questions to ask before paying
- Can you send a close-up photo of the dial under natural light, straight on, no filters?
- What movement is inside, and is it hand-wound only?
- What is the exact case diameter and thickness in millimetres?
- What happens if the watch arrives with a defect?
Anyone selling this reference who cannot answer those four things is guessing too. Ask for a video of the seconds hand sweeping and of the watch being wound. It takes the seller two minutes and tells you plenty.
Price expectations
Cheap examples of this reference exist and they look it. The dial print is the giveaway at every price point, so compare photos side by side before you commit. Pay for the dial and the case, not for a fancy box. A box and papers add nothing to a replica's quality and everything to its price.