Quick answer

A fake IW328090 is a replica made to look like IWC reference IW328090. It is not an IWC-built watch. The reference number is easy to copy. The hard parts are the dial print, case finishing, crown feel, movement, and paperwork. If a seller calls it a first copy, ask which details match the real reference and which do not.

Start with the reference, not the photos

I check the reference first. IW328090 should match a known IWC model family, case size, dial layout, and bracelet or strap option. A fake can carry the right number and the wrong proportions. Compare the case diameter, lug shape, dial color, and date placement against IWC's own reference data. If the seller cannot state the model family, stop there.

Dial and hands

Macro photos tell you more than a hero shot. Look at printing under the logo, the minute track, and the numerals. Real IWC finishing is crisp and even. Replicas often show thick paint, fuzzy edges, or lume that sits proud of the dial. Hands should be clean at the edges, with no tool marks. The date window should line up with the dial cutout, not sit low or high. A fake IW328090 often wins at arm's length and loses at 10 cm.

Case, crown, and caseback

Run a finger over the case flanks. Sharp steps and burrs are a bad sign. The crown should turn with a firm, even feel and pull to the setting positions without grit. Caseback engraving is another weak point: shallow laser marks, wrong font weight, or a misspelled city are common. On a watch with a display back, look at the movement finish. On a closed back, the engravings and caseback fit matter more.

Movement and timekeeping

Ask for a timed rate, amplitude, and beat error if the seller has a timegrapher. A fake may keep time for a week and fail after a month. The winding feel is a tell too. Gritty winding, a loose rotor, or a date that flips late point to a cheap base movement. If the watch is sold as a first copy, do not assume the movement is serviceable. Ask who can service it and what parts are available.

Paperwork, price, and seller behavior

Paperwork is easy to print. A box and card prove less than a clear return policy. I look for sellers who show the actual watch, not catalog images, and who answer questions about weight, case thickness, and bracelet screws. A price that is far below the market for a genuine IWC is not a bargain. It is a warning. For first-copy watches, the useful question is not whether it is real. It is which parts are correct, which are approximations, and can I return it.

Bottom line

Treat a fake IW328090 as a copy with known compromises. Check the reference, then the dial, case, crown, movement, and seller terms in that order. If the details do not survive close photos and direct questions, walk away.