The short answer
A watch sold as IW328080 is fake when the price, the paperwork, or the caseback engraving does not line up with the reference as the manufacturer publishes it. A single reference number is easy to stamp onto a cheap case, so the number alone proves nothing. Judge the watch on four things: engraving quality on the caseback, the measured case size, the finish of the dial and hands, and the provenance of the papers. If two or more of those fail, walk away.
What the reference number is for
IW328080 is an IWC reference number, and reference numbers exist so buyers can check claims. IWC publishes every current and recent reference with its case material, diameter, thickness, dial variant, and movement. Pull up that listing before you look at a single photo of the watch. If a seller advertises IW328080 but the case size, dial color, or case material in the photos does not match the published reference, the listing is already wrong. Replica sellers routinely paste a real reference onto a watch that shares nothing with it except a dial logo.
Prerequisites
- A 10x jeweler's loupe
- Digital calipers
- A kitchen scale that reads to 1 gram
- A phone with a macro or close-focus mode
- Access to the manufacturer's reference listing for IW328080
- Any box, warranty card, or service receipt the seller claims
Step by step inspection
- Ask the seller for a straight-on photo of the caseback plus close-ups of the reference number, serial number, and material stamp.
- Compare that engraving against the published reference details: font, letter spacing, stamp depth, and the position of each mark on the caseback.
- Measure case diameter and thickness with calipers and compare both numbers to the published spec, allowing a tenth of a millimeter for tool error.
- Weigh the watch head without the strap, then compare the result to the expected weight for that case material and size.
- Shoot the dial in macro and inspect the logo, the brand name, and any printed text for bleeding edges, uneven spacing, or an appliqué that sits proud of the surface.
- Examine the hands under the loupe for rough edges, incorrect length, and paint that stops short of the tip.
- Wind the crown and set the hands, feeling for grit or wobble and checking that the crown seats flush against the case.
- Watch the date change at midnight and confirm the date wheel sits centered in the window.
- Hold the case under raking light and look for polishing that rounds the lug edges or blurs the line between brushed and polished surfaces.
- Have a watchmaker open the caseback, or request movement photos from the seller, then compare rotor engraving and finish to the calibre the reference should carry.
- Match the serial number across the caseback, warranty card, and service records, and confirm the number returns a valid record with the manufacturer.
- Take the watch to an authorized service center or an independent watchmaker who services the brand, and pay for a written opinion before any money changes hands.
Red flags in listing photos
- Angled or soft caseback shots that hide engraving quality
- Stock catalog images with no hands-on photos of the actual watch
- No serial number shown, or a serial that is scratched out in the photo
- A price far under the current used market for that reference
- Wording such as clone, 1:1, super clone, or mirror quality
- Papers that list a different reference, or a card serial that does not match the case
- No return window, no inspection period, and pressure to pay outside a protected platform
What remote checks cannot settle
Photos cannot verify movement finishing, magnetism, water resistance, or true case weight. A well-made fake survives a photo review and fails a bench review, which is why the inspection step with a watchmaker matters more than any comparison image. If a seller refuses an inspection period or a return window, treat that refusal as the answer.
If you already bought one
File a return request through the platform before the window closes, keep the listing and chat history, and dispute the charge with your card issuer if the seller stalls. In the United States, importing or selling counterfeit watches is illegal, so a report to the platform and, where money was lost, to the relevant authorities is a reasonable next step.