The short answer
Pick a high-grade replica first. On an IW322017 the details that separate a fake from a genuine are case thickness, dial printing, hand finishing, and what sits behind the sapphire caseback. A top-tier fake gets those four right. A budget fake fails on at least two, usually thickness and print. Everything below is a check you can run in ten minutes with a loupe, calipers, and a daylight lamp.
What to have on hand
- Digital calipers that read to 0.1 mm
- 10x jeweler's loupe
- Daylight or a 5000K lamp
- A soft cloth and a clean tray
How to compare a fake IW322017 to a real one
- Place the genuine and the replica side by side on the tray under the lamp, both with the crown at three o'clock.
- Measure case diameter at the widest point and case thickness at the center of the caseback, then write both numbers down.
- Compare the two thickness readings first, because replica cases are often thicker than the genuine and the difference shows at the wrist.
- Inspect the dial printing through the loupe, checking stroke weight, letter spacing, and the edges of each letter for ink spread.
- Look at the applied hour markers from a low angle, confirming that each one sits flat and that the lume fill is level with the frame.
- Examine the hands under the loupe for polished bevels, sharp tips, and length that reaches the minute track without touching it.
- Tilt the crystal toward the lamp and compare reflections, since genuine anti-reflective coating cuts glare on both sides.
- Turn both watches over and compare the caseback engraving depth, font, and spacing of the reference and serial numbers.
- Open the caseback or view it through the display back, then compare movement finishing, rotor engraving, and screw color.
- Set the time on both and feel the crown, noting thread quality, stem play, and how firm each click position feels.
- Weigh both watches on a gram scale, then compare the strap stitching, edge paint, and buckle engraving.
Replica options, ranked
- Tier 1, closest match: Correct case proportions, lacquered dial with sharp pad print, faceted hands, decorated automatic movement. Choose this if the watch will be seen up close.
- Tier 2, mid grade: Good dial and case, weaker movement finishing and a crystal with lighter coating. Acceptable if you wear it under a cuff.
- Tier 3, budget: Thick case, flat print, plain movement. Fine as a knockaround piece, obvious next to a genuine.
What no replica matches
A fake can copy the outside of an IW322017, but it will not carry a manufacturer warranty, a service history, or the same movement architecture. Authentic IWC calibers are built and finished in Schaffhausen, and the brand publishes case and movement data per reference, which is the baseline you should measure against. Treat any replica as a lookalike, not an investment, and keep the genuine paperwork away from it.