Quick answer
A fake IW323736 fails in the same four places almost every time: weight, case back engraving, dial printing, and the movement behind the case back. Start with the external checks and the paperwork. Move to the movement last, and only if you can do it without damaging the watch. One flaw proves nothing. Three or more small errors together usually do.
What you need before you start
- A 10x jeweler's loupe
- A calibrated scale accurate to 0.1 g
- Digital calipers for case diameter and thickness
- A phone with a macro or close-focus camera
- A soft cloth and a clean, well-lit surface
- A strap tool if you plan to inspect the movement
Do not open a watch that is still under warranty or that you must return in original condition. Finish the external checks first so the case stays untouched.
Step-by-step checks
- Weigh the watch head with the strap or bracelet removed. Counterfeit cases use plated brass, zinc alloy, or light steel. A genuine case in the same size reads heavier on the scale. Write down the exact gram figure.
- Measure case diameter and thickness with the calipers. Compare both numbers against the specification for the reference. Replica cases often run 0.5 to 1 mm thicker because the movement and spacer need more room.
- Read the case back engraving through the loupe. Genuine engraving is cut into the metal with crisp edges. Replica engraving is laser-etched, shallow, and soft at the borders. Check the reference number, the serial, and the origin line for spacing and font errors.
- Compare the serial against the reference number. Counterfeiters reuse a small pool of serials across many watches. Search the serial and count the listings that show it. A serial that turns up on ten listings is a warning sign.
- Inspect the dial under magnification. Look at the brand name, the reference line, the rail track, and the date aperture. Replica dials show thick or uneven paint, fuzzy edges, and a date window that sits off center.
- Check the applied markers and the hands. Genuine markers sit flat, reflect cleanly, and carry finishes that match the case. On fakes the markers may tilt, reflect unevenly, or show excess adhesive at the base.
- Look at the lume color and application. Most references use a flat, even, off-white to pale green tone. Fakes often show a duller or yellower lume, or lume applied unevenly on the hands.
- Examine the crown and crown guards. The crown should wind with light, consistent resistance, and the engraving on the crown head should be sharp. A crown that grinds, wobbles, or sits proud of the case is a common replica tell.
- Check the crystal and any anti-reflective coating. The crystal should be sapphire and should resist a light scratch on the underside edge. Coating on a fake often sits as a film with a strong color cast.
- Inspect the bracelet or strap and the clasp. Check end link fit, screw heads, and clasp engraving. Genuine screws are machined and take a proper driver without stripping. Replica screws are soft and marked up.
- Check the movement. With a display back, look at finish, rotor engraving, and regulation. With a solid back, ask for a timing reading instead. A genuine movement holds a stable rate across positions. A cheap replica movement swings wide between dial up and crown down.
- Ask for the box, papers, and service history, then verify them. Contact an authorized service center with the reference and serial. They can confirm whether the numbers match a serviced watch and whether the case back belongs to that reference.
Where replicas fail
Four areas account for most of the tells. The case back: engraving depth and font. The dial: print thickness and date alignment. The movement: rate stability and winding feel. The paperwork: a serial that the brand cannot confirm.
Legal and money risks
Importing a counterfeit trademarked watch into the United States is prohibited. U.S. Customs and Border Protection can seize and destroy the shipment, and the buyer loses the money with no recourse. Counterfeit watches also cannot be serviced by the brand, have no parts support, and hold no resale value. Treat any offer that depends on a fast payment method or a private message as a loss waiting to happen.
When to get a professional opinion
If the watch passes every external check and you still have doubts, take it to an authorized dealer or an independent watchmaker who services the brand. Ask for a written condition report and a timing result. That report is what counts if you need to return the watch or file a claim.