The short answer

A fake IW323790 lives or dies on three things: case proportions, dial printing, and the bracelet. Buyers who fixate on the movement name alone still get burned, because a reliable automatic inside a case that is two millimeters too thick looks wrong the moment it goes on a wrist. Before you pay, ask for dated photos of the actual unit next to a ruler and on a scale, compare the numbers against the specifications IWC publishes for the reference, and buy only from a seller who offers a written return window. If any of those three things is missing, walk away.

What the reference actually is

IW323790 is an IWC reference number, which means the genuine article comes from a Swiss brand with a published specification sheet covering case size, caliber, water resistance, crystal type, and bracelet dimensions. Treat those published figures as your checklist, not the seller's description. A first copy is a reproduction built to imitate that design, and batches vary between workshops and even between runs, so documented measurements matter far more than a factory nickname repeated on forums.

Be clear about what you are buying. A first copy is not an IWC watch. It carries no brand warranty, no service history, and no collector value, and it should never be resold or described as genuine. In the United States, selling goods that carry a registered trademark without authorization is illegal, and counterfeit shipments can be seized at import.

What to look for before you buy

  • Dated proof photos. A timestamp, calipers or a ruler, and a kitchen scale. Stock catalog images tell you nothing about the unit you will receive.
  • Case profile. Study the side view: the caseback curve, the crown guards, and how the bracelet meets the lugs.
  • Dial details. Applied markers should sit flat and evenly spaced, the date window should be square and centered, and printing should stay crisp under magnification.
  • Bracelet and clasp. Check the taper, how links fit together, engraving depth, and whether the clasp closes with a solid click rather than a rattle.
  • Movement disclosure. A serious seller names the exact caliber, the beat rate, and the power reserve. Vague language about Swiss parts is a warning sign.
  • Return terms. Seven days minimum, in writing, with the condition rules spelled out in advance.

Parameter bands to compare

  • Case diameter: within about 0.5 mm of the published figure. A case that is 2 mm oversize is the single most common tell.
  • Case thickness: roughly 10 to 12 mm for this style of steel sports watch. Anything above 13 mm rides high on the wrist and catches sleeves.
  • Weight on a full steel bracelet: about 130 to 170 g. A hollow, tinny bracelet often lands near 100 g.
  • Crystal: sapphire, 2 to 3 mm, with anti-reflective coating applied to the underside. Mineral glass scratches and shows swirl marks within weeks.
  • Movement: automatic, 28,800 vph, with 38 to 42 hours of power reserve on common third-party calibers. A claimed 70 hour reserve at a bargain price is usually marketing copy.
  • Water resistance: treat any claim above 50 m as unverified unless the seller pressure tested that specific unit and says so.
  • Lume: applied evenly and glowing for several hours. Patchy or faint lume indicates a cheap dial print.

Pitfalls that cost buyers money

  • Paying by irreversible method. Once funds leave, a dispute is difficult and often pointless.
  • Trusting the word waterproof. Gaskets on inexpensive cases are rarely tested, so keep it away from showers and pools.
  • Buying the first batch. New releases usually improve after a few revisions as feedback reaches the workshop.
  • Ignoring the bracelet fit. A bracelet that pinches or pulls will make you stop wearing the watch, which defeats the purpose.
  • Assuming resale value. There is none. Buy it as a wearer, not as an asset.

Legal and practical risk

Customs authorities in the United States can seize counterfeit merchandise, and the buyer typically has no recourse. Trademark law also prohibits selling goods bearing a mark that is likely to confuse buyers about the source. Keep the purchase for personal use, never present the watch as genuine, and do not attempt to pass it on to a buyer who believes it is real. Beyond the legal side, there is a practical cost: no manufacturer service, no parts network, and no warranty if the movement fails.

FAQ

Is a first copy the same as a fake?

In everyday use the terms overlap. Both describe a watch made to imitate a branded design without authorization. The difference is mostly in how the seller markets it, and no wording changes the legal position.

Why is case thickness the biggest giveaway?

Because it is measurable in seconds and almost impossible to fake. An automatic movement, a spacer, and a caseback all add height. If the total exceeds the published figure, the silhouette is wrong from across the room.

Can a replica be serviced?

Independent watchmakers will often work on common third-party calibers, and they will usually refuse to touch anything with branding they do not want to handle. Ask before you buy, and expect to pay for the work yourself.

Does the factory name matter?

Less than sellers suggest. Two units from the same workshop can differ, and names get reused by unrelated sellers. Photos, measurements, and return terms tell you more than a label.

What should I check the day it arrives?

Weigh and measure it, check that the date flips cleanly at midnight, wind it fully and time it over 24 hours, inspect the crystal for coating damage, and confirm the clasp and crown operate smoothly. Report problems inside the return window.