Quick answer
A fake Portugieser Hand Wound 40 tends to slip on the same three things: the case runs too thick, the small seconds subdial sits slightly off or the hand is the wrong length, and the movement behind the display back is not actually hand wound. Put calipers on the case, look at the subdial through a loupe, and ask for a clear photo of the back with the crown pulled. That sequence catches most of what gets sold as a replica.
Lock down the real specs first
You cannot judge a copy without a baseline. The hand-wound Portugieser in the 40 mm case is a thin dress watch with a manually wound movement and small seconds at 6 o'clock, so the profile and the subdial are the two features a copy has to nail. Pull the spec sheet for the exact reference before you open any listing. Diameter, thickness, lug width, water resistance, and power reserve are all published, and the diameter is given to a tenth of a millimeter. If a seller cannot recite those numbers, or the numbers they give do not match, you are done. No further inspection needed.
One rule I keep coming back to: hand-wound watches are thin because there is no rotor sitting on top of the movement. A 40 mm Portugieser with a manual caliber should sit low on the wrist and slide under a shirt cuff. Replicas built on automatic movements are almost always a millimeter or two thicker, and listing photos are shot at angles that hide it.
Five checks that do most of the work
- Measure the case. Calipers, not a ruler and not the listing text. Check diameter and thickness against the published figures.
- Confirm it is hand wound. Pull the crown out to the winding position and feel it. A manual movement winds with a light, even ratchet feel. An automatic base dressed up as a manual one behaves differently, and it often shows a rotor through the back, which is an immediate tell.
- Study the small seconds at 6. The hand should reach the printed track on the subdial, not stop short. The subdial should sit dead center on the vertical axis.
- Check the dial printing. Look at the logo and branding under magnification. Clean edges, consistent stroke weight, no fuzzy bleed into the lacquer.
- Compare the crown. Size, shape, and how it seats against the case. Copies often oversize it or leave a visible gap.
Movement and caseback
The display back is where the money shows. A genuine IWC manual movement is finished on both sides of the bridges, with Geneva stripes, polished bevels, blued screws, and engraving that is cut rather than stamped. Replica finishing looks flat under raking light: stripes that fade out at the edges of a bridge, chamfers that are rounded instead of crisp, engraving that reads gray instead of bright. Take a phone photo of the back with the light at a low angle. The difference shows up fast.
Check the layout against photos of the real caliber too. Bridge shapes, the position of the balance, and the text engraved on the movement should match. A copy will often drop in a generic movement and print a plausible-looking name on it.
Dial, numerals, and the small seconds
Portugieser dials use applied Arabic numerals with faceted, polished edges. Look at the numerals from the side. On the real thing, each one is a separate piece with a bevel that catches light along one edge. On copies, the numerals are often stamped, thinner, and sit flatter, or they are printed and only look applied in photos.
The small seconds is the other weak point. Check the hand shape and length, the printed track, and whether the subdial ring is a separate applied ring or just printed on the dial. Under a loupe, look at the hand bevels and any tool marks left on the flat.
Case, crystal, and strap
The crystal should be sapphire with a slight dome and anti-reflective coating that stays neutral. Copies often use flat sapphire or mineral glass with a heavy blue tint that shows from the side. Case finishing is another giveaway: brushed surfaces should be even, and polished bevels should stay sharp where they meet the brushed planes. Run your eye along the lug edges. Wobble or a soft transition means a copy or a badly refinished case.
Strap and hardware matter more for the story than for authenticity. Check the buckle signature, the stitching, and whether the strap matches the reference. Sellers swap straps all the time, so treat this as a secondary check.
Price and paperwork
If the price is a small fraction of the going secondary market rate, the watch is not real, whatever the listing says. Ask for service records, the original card, and a photo of the serial and reference numbers. Then verify the reference against the case material and dial variant. Mismatched numbers and a vague history are the two most common signs of a counterfeit being sold as genuine, which is a different and more serious problem than a replica sold as a replica.
Bottom line
Buy the seller before you buy the watch. Get movement photos, measure the case, and compare everything to the published spec sheet. If any single check fails, walk.