The fastest reliable answer: an IW328090 counterfeit is confirmed by opening the case, inspecting the movement, and cross-checking the reference and serial engravings against IWC records. Paperwork, box condition, seller history, and price are supporting evidence only. This guide ranks each check by what it catches, what it misses, and when it is worth the effort.
Reference number and model pairing
Counterfeit listings often put a real reference number on a watch that never existed in that configuration. Look at case size, dial layout, date placement, and strap or bracelet option, then confirm the reference appears in IWC's catalogue, current or archived. A reference paired with the wrong dial colour or case material is a hard stop.
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- Pros: free, fast, and it filters careless listings before you contact the seller.
- Cons: accurate pairing is easy to copy, so passing this check means little on its own.
Caseback engraving and serial numbers
Genuine engraving is crisp, with even depth and a consistent typeface. Counterfeits usually show shallow, sandy edges, uneven spacing, or a font that is slightly too wide. Read the serial and compare it with the warranty card and any service paperwork, then search that number. The same serial appearing on several unrelated listings is one of the strongest counterfeit signals available.
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- Pros: costs nothing, needs only a loupe and a search engine.
- Cons: counterfeiters copy genuine serials from auction photos, so a clean number proves nothing.
Movement inspection
This is where most fakes fail. A genuine IWC movement shows defined finishing: perlage, Geneva stripes, blued or polished screws, and a signed rotor with correct engraving. Counterfeits usually hide a generic or cloned movement that is undecorated, or decorated with printed patterns that look flat under a loupe. A watchmaker with a timegrapher can read the beat rate, amplitude, and beat error. If a watch that should run at 28,800 vibrations per hour ticks at 21,600, the case is settled.
- Pros: the hardest thing for a counterfeiter to replicate at any price.
- Cons: requires a watchmaker, and opening the case can affect water resistance and any remaining warranty.
Dial, hands, and crystal
Under magnification, genuine dial printing has clean edges and consistent ink weight. Check that applied indices sit level and evenly spaced, that the date wheel is centred in its window, and that lume application is uniform in colour and thickness. Genuine sapphire usually carries anti-reflective coating on both faces, which shows a faint blue tint at an angle. A crystal with no coating, or with a purple or green cast, is suspicious.
- Pros: needs only a loupe and a light, with no disassembly.
- Cons: better fakes pass this at arm's length, and photographs hide exactly the flaws this check finds.
Case, crown, and bracelet finishing
Study the transitions between brushed and polished surfaces. Genuine cases have sharp, deliberate lines. Fakes often show rounded edges, uneven brushing, or polish bleeding into brushed areas. Check the crown threads, the signed crown, the spring bar holes, and the fit of the end links. Weight is a weak tell on steel watches, so do not lean on it.
- Pros: visible in person without tools, and useful for ranking two candidates.
- Cons: subjective, and it requires the watch in hand.
Box, papers, and service history
Warranty cards, dealer stamps, invoices, and service receipts tell you about the watch's life rather than its authenticity. A complete set with a matching serial and a dated invoice from an authorised dealer raises confidence. A full set from an unknown source does not, because counterfeit packaging is inexpensive and widely available.
- Pros: quick to review, and it supports resale value later.
- Cons: paperwork is the easiest part of a counterfeit package to fake.
Price and seller behaviour
A genuine IW328090 offered far below the going rate is the oldest warning sign in the market. Other signals: no returns accepted, pressure to pay by bank transfer, refusal to meet at a watchmaker, stock photos that appear on other listings, and a seller who cannot describe the watch's service history. Run the listing images through a reverse image search before you send money.
- Pros: catches most scams before any money moves.
- Cons: honest sellers sometimes price low for real reasons, and established dealers have sold fakes without knowing.
Getting an IW328090 authenticated
Use an IWC boutique or authorised service centre, an independent watchmaker who works on Swiss brands, or a paid authentication service that provides a written opinion. Ask what the inspection covers: movement, case, dial, and paperwork, or a visual check only. Pay with a method that allows a chargeback, and keep the listing, the messages, and the photos.
- Pros: a written opinion is what you need if you plan to dispute a sale.
- Cons: costs money and time, and a visual-only service proves less than buyers assume.
Which check to use in each situation
Private online seller: start with reference pairing, a serial search, a reverse image search, and a payment method that allows a chargeback. In-person meeting: bring a loupe, meet at a watchmaker, and pay for a movement inspection before money changes hands. Established dealer: review the service history and warranty terms, and get the return window in writing. Already own it and unsure: go straight to movement inspection, since the surface checks have already been passed or cannot be repeated.