The quickest way to judge a fake IW323790 is to ignore the dial and go straight to the caseback engraving, the movement, and the bracelet end links, in that order. Cosmetic details get copied well. Tolerances, engraving depth and movement finishing do not. If you have two minutes with a seller, work through the checks below in sequence and stop at the first failure. That order separates a genuine IWC Ingenieur from a counterfeit in most cases, and it also tells you when a replica is being sold honestly as a replica instead of being passed off as the real thing.
What people mean by "fake IW323790"
Three different things get called fake, and they need different responses.
- A counterfeit sold as a genuine IWC. This is fraud, and the price is usually the first clue.
- A replica sold as a replica, where the buyer knows what they are getting and pays accordingly.
- A franken watch: genuine case, aftermarket dial, swapped movement. The hardest to catch, because part of it is real.
Criterion 1: Caseback engraving, reference and serial
Genuine IWC engraving is cut into the metal, not stamped on top of a polished surface. Under a loupe, the letterforms should have even depth and crisp edges, and the reference and serial should match the paperwork and the values IWC publishes for the reference. Counterfeits typically show shallow laser etching, a font that is close but not identical, and serials that repeat across batches.
- Pros: fast to read, expensive to imitate well.
- Cons: mid-tier replicas now use proper engraving, so a clean caseback proves nothing on its own.
Best for: a first-pass filter before you spend time on anything else.
Criterion 2: Movement and timekeeping
Ask for a clear photo with the caseback removed, or inspect the movement through an exhibition back if the reference has one. IWC lists the calibre for each reference, so match the number you see against the official specification. Look at the finish as well: rotor decoration, perlage on the plates, screw heads, and a balance that oscillates without a wobbling rotor. A movement that does not match the calibre IWC lists is a counterfeit no matter how good the dial looks. Timekeeping is a weak test by itself, because a cheap quartz copy can keep better time than a mechanical original.
- Pros: decisive, and hard to fake below a certain price point.
- Cons: requires opening the watch or trusting a seller's photo.
Best for: any purchase where the asking price is close to genuine market value.
Criterion 3: Bracelet, end links and clasp
The gap between the end link and the case is where replicas show themselves. On a genuine bracelet the end link meets the case on an even line with no daylight, the clasp closes with a firm click, and the links articulate without lateral play. Push gently on the bracelet near the lugs. Flex, rattle, or a visible seam means the watch is not what the seller claims.
- Pros: checkable in seconds, no tools needed.
- Cons: straps and bracelets get swapped, so a bad bracelet on a good watch is possible.
Best for: buying in person or from detailed listing photos.
Criterion 4: Dial printing, hands and date
Print should be flat and sharp under magnification, indices should sit level and reflect light along a consistent line, and the date should center in its window. Replica dials commonly show slightly thick fonts, a date sitting high or low in the aperture, and hands with a rough edge where the lume meets polished steel. Compare the dial layout against IWC's own reference photos rather than against another listing, which may itself be a copy.
Criterion 5: Case finishing, crown and crystal
Check the lug bevels, the transition between brushed and polished surfaces, and the crown threads. Genuine finishing holds a hard line between the two zones. Copies blur it. Anti-reflective coating should be subtle, with no blue or purple tint at an angle. Measure the case with calipers and compare against the dimensions IWC publishes for the reference, because eyeballing a 0.5 mm difference does not work.
Criterion 6: Box, papers and the seller's story
Boxes and cards are the cheapest part of a counterfeit to produce and the hardest to verify, so treat them as supporting evidence only. Verify the serial with IWC or an authorised service centre, ask for the original purchase receipt with a matching date and dealer, and be wary of any seller who refuses an inspection or pushes for a quick decision. A price far below the going rate for a genuine example is the loudest single signal.
Genuine, replica, or counterfeit: which fits your case
Genuine IWC. Full brand service, warranty, insurance value, resale. Costs the most and service bills add up. Best for collectors and anyone who wants the watch to hold value.
Replica sold honestly as a replica. Visual match at a fraction of the cost, no risk of paying genuine money for a fake. No brand service, resale near zero, and movement quality varies by source. Best for casual wear where the look matters more than the paperwork. Selling one as genuine is illegal.
Counterfeit passed off as genuine. No upside. You cannot verify it, you have no recourse, and buying or selling it can carry legal consequences.
Bottom line
Filter with the caseback, the movement and the bracelet, in that order, then use the dial, crystal and box as secondary checks. If a seller presents a replica as genuine, walk away; the watch is the smaller problem. If you are buying a replica knowingly, buy from a source that says so plainly and stands behind the movement.