Quick answer
A replica IW328071 is worth your money only when the case is 40 mm across, the dial printing is matte and crisp, and the movement beats at the correct rate with a functioning date change. The three fastest tells on a bad copy are the hand shape, the date window edges, and the crown height. Inspect those three before you look at anything else.
What the reference is
The IW328071 sits in the IWC Pilot's Watch Mark line, which means a stainless steel case, a black dial with large white Arabic numerals, a triangle at 12, and a date window at 3. Genuine versions use a soft-iron inner case for magnetic shielding and an automatic movement with roughly 120 hours of reserve in the current generation. Confirm the exact spec on the manufacturer's own reference page before you compare any copy against it, because IWC changes details between production runs.
Before you buy
- Ask the seller for the factory name and the version number of the build.
- Request photos taken in daylight, not studio light.
- Request a short video of the second hand sweeping and the date flipping.
- Confirm the return window and who pays return shipping.
Step-by-step inspection
- Measure the case across the bezel at 12 and 6. It should read 40 mm, not 41 or 39.
- Measure lug-to-lug. A copy that runs long will overhang a smaller wrist.
- Check lug width at 20 mm and confirm the end links sit flush with the case sides.
- Look at the dial under a loupe. Numerals should be flat matte white, with no gloss and no bleeding at the edges.
- Inspect the triangle at 12. The two dots beside it should be round and evenly spaced.
- Examine the date window. Edges should be cut clean and the numeral should sit centered in the frame.
- Check the hands. The sword hands should be flat, with the lume pad sharply bordered and no paint overflow onto the polished sides.
- Look at the crystal from a low angle. You want a faint blue-violet tint, not a heavy purple wash.
- Hold the watch to a light and check the lume charge. It should glow evenly across all markers within a minute.
- Wind the crown and feel for grit. A smooth action with a clean click at each position is the target.
- Set the date past midnight and watch it snap rather than creep.
- Place the watch on a timegrapher. Check the rate, amplitude, and beat error.
- Test the clasp. It should close with one firm press and release with one thumb movement.
Movement check
Most copies in this reference run a clone automatic with a decorated rotor. Look for these problems: a rotor that wobbles when you tilt the case, a date that changes over 40 minutes instead of snapping, and a power reserve that falls well short of the claim. Run the watch for 24 hours off the wrist and compare the time against a known reference clock.
Red flags
Walk away if the seller refuses close-up dial photos, if the listed case size is vague, or if the price is far below the market for this factory. A cheap copy of a pilot's watch almost always fails on lume, crystal clarity, and clasp fit.