A "fake IW323776" means one of two things. Either someone is passing a counterfeit off as a genuine IWC, or you are knowingly shopping a replica of that reference. The reference is a steel IWC sports watch, and it is not one of the models replica factories chase hardest, so the copies in circulation are mostly mid-tier builds with real shortcuts. If a seller offers you an unworn IW323776 at a third of the normal secondary price, assume counterfeit until the paperwork and the watch prove otherwise. If you want a replica, buy it as a replica and judge it on fit, finish and movement, not on the story attached to it.

Which situation are you in?

These are different problems and they need different checks. Buying a replica means you already know the watch is not genuine, so your questions are about quality and whether the seller ships what was photographed. Buying something advertised as genuine means your questions are about fraud, and the only safe answer is documentation plus an independent inspection. I would not spend real IWC money on a private sale without a movement photo and a return window in writing.

Details that separate a decent copy from a bad one

Reference-level IWC details are where replicas slip. Look closely at these before you commit:

• Caseback engraving depth and font. Reference numbers and serials should be crisp, evenly spaced and consistent with the case metal.
• Dial printing. Text should be sharp under a loupe, not softly doubled or sitting on a raised pad of paint.
• Applied indices and lume. Height should be uniform, and lume plots should sit level inside their surrounds.
• Date wheel font and alignment. A crooked or oversized numeral is one of the easiest tells.
• Bracelet end link fit. Gaps and wobble at the lugs show up fast on cheaper builds.
• Crown action and thread feel. Gritty threading on a screw-down crown is a bad sign for the whole case.

Movement and caseback

Genuine IWC sports references use in-house calibres, and the finishing under the display back is part of the product. Replicas usually run a clone, an ETA derivative or a Japanese automatic. Ask for a clear photo of the movement, then check beat rate and rotor engraving against the calibre the reference should carry. A 21,600 bph movement in a watch that should run at 28,800 is an instant no. Also check that the caseback markings match the reference rather than a neighbouring model, which is a common mix-up on less popular references.

Seller vetting and the photos to request

Ask for macro shots of the dial, the crown side, the caseback and the clasp, plus a short video with the seconds hand running and a timestamp. Refuse stock images. Pay with something that has buyer protection, and avoid bank transfer or crypto with a stranger. On the replica side, established communities with review history are worth more than any single seller's promises.

Price sanity

Secondary listings for a given reference cluster in a fairly narrow band, which makes outlier pricing easy to spot. Anything far below that band is either not the watch described or not genuine. On the replica side, very cheap means a low-grade build, and very expensive does not automatically mean high grade.

Ownership realities

Most watchmakers will not service a counterfeit, and parts for replica movements can be hard to source. Water resistance claims on replicas should be treated as fiction until a shop pressure-tests the case. Resale value is close to zero. Buy accordingly, and keep your expectations calibrated to what you paid.