The short answer: the fake IW329090 worth owning is the automatic first-copy tier, the one with a machined dive bezel, a case that matches the genuine lug profile, and dial text that stays crisp under a loupe. Judge any version by six things: case finishing, bezel action, dial and lume, crown and caseback engraving, the movement inside, and honest water resistance. Anything below that tier is a quartz costume piece with a logo glued on. The sections below break down each check, then compare the two tiers you will actually find for sale.

What the IW329090 Is and Why Fakes Are Everywhere

IW329090 sits inside IWC's Aquatimer dive family, a steel sports watch with a rotating dive bezel, a screw-down crown, an automatic movement, and a case built for water. That combination is exactly what makes it a target. A dive watch has a lot of surface area for a counterfeiter to get wrong: bezel detents, crown threads, caseback engraving, bracelet taper, and lume that either glows or does not. It also has a simple, legible dial, which is the easiest part of a watch to copy and the last part buyers inspect. The result is a market with a wide gap between genuine, high-grade first copies, and junk.

Tier One: The Automatic First Copy

This is the version that copies the case architecture rather than just the look. It uses a real automatic movement, a screw-down crown with cut threads, and a bezel that clicks through set positions instead of spinning free.

• Pros: case thickness and lug shape match the reference spec, dial print is applied rather than stamped, lume charges and fades at a normal rate, the bracelet end links sit flush against the case with no daylight gap, and it survives daily wear and hand washing.
• Cons: costs several times what a quartz fake costs, the movement will eventually need a service or swap, and no replica should be trusted as a dive instrument.

Buy this tier if: people will see the watch on your wrist at arm's length, or if you care how the crown feels when you set it.

Tier Two: The Quartz Budget Fake

Cheap, plentiful, and instantly recognizable to anyone who knows the reference.

• Pros: very low cost, accurate timekeeping, and no winding or setting fuss. Easy to replace if it dies.
• Cons: a ticking second hand on a watch whose genuine version is automatic is the fastest tell there is, the case is usually thinner than the real profile, indices are often glued and can fall off, and there is no meaningful water sealing.

Buy this tier if: you want a prop for a photo set or one evening, and you never plan to hand the watch to anyone who knows watches.

The Six Checks

1. Case and Lug Finishing

Run a fingernail along the edge between the brushed top and the polished flank. A good copy has a defined, even line. A bad one has a soft, rounded transition because it was over-polished at the factory. Check the lugs for thickness; thin, pinched lugs are the most common proportion error.

2. Bezel Action

Turn the bezel through a full rotation. It should move with firm, even resistance and land exactly on the 12 marker. Gritty travel, sideways play, or a bezel that stops half a click off are all signs of a low tier. If the reference uses an internal bezel, check that the second crown engages without wobble.

3. Dial, Indices, and Lume

Look at the dial text with a phone camera zoomed in. Genuine-grade print has sharp edges and no ink bleed. Indices should sit at the same height and the same distance from the chapter ring. Charge the lume under a lamp for thirty seconds and watch it in a dark room: a real application glows and fades over minutes, paint glows weakly and dies fast.

4. Crown and Caseback

Unscrew the crown. Threads should feel smooth for several turns, not catch after half a turn. The caseback engraving should be deep and clean, with lettering of consistent weight. Shallow laser etching that looks grey rather than cut is a budget marker.

5. The Movement

Ask what is inside before you pay. A sweeping seconds hand tells you it is mechanical. If the seller cannot name the movement or sends a photo of a decorated plate with no markings, treat the watch as a quartz build in a mechanical-looking case. Note also that IWC is known for antimagnetic soft-iron inner cases on tool watches, and no replica at any price reproduces that construction, so never assume magnetic protection.

6. Water Resistance

Assume nothing. Even a well-built first copy is sealed by a factory that is not testing to ISO 6425, the standard that defines dive watch water resistance and legibility requirements. Hand washing and rain are realistic limits. Swimming, and certainly diving, are not.

Red Flags in Online Listings

• Stock photos only, with no close-up of the crown, caseback, or clasp.
• No stated movement type, or a vague phrase like "high grade machinery."
• Claimed depth ratings of 300 meters or more on a watch with a snap-on caseback.
• A price so low that it cannot cover a machined steel case and an automatic movement.
• No return window, which removes your only real leverage after delivery.

Who Should Buy Which

If the watch is for you and you wear it often, buy the automatic first copy and budget for a strap change and a movement service down the road. If it is for a costume, a shoot, or a single event, the quartz tier does the job at a fraction of the cost and you will not mourn it. If you want a genuine dive watch you can actually swim in, buy neither tier and save toward the real reference, because the one thing no replica sells you is a warranty and a tested seal.