Short answer

A fake IW328070 gives itself away in three places: the dial printing and lume, the caseback and movement finish, and how the movement actually runs. The genuine watch is an IWC Pilot's Watch Automatic 41 in steel with the in-house calibre 32111 and a 120-hour power reserve. Most replicas use a modified third-party automatic with a 38 to 45-hour reserve, so a four-day rest test settles more arguments than any photograph.

Confirm which dial and strap variant you are looking at before you compare anything. The 3280 family covers several combinations, and a seller who mislabels the variant is already a problem.

Before you start

  • 10x jeweler's loupe or a macro lens
  • Digital calipers
  • UV torch for the lume test
  • IWC's published specification sheet for the exact reference
  • Daylight and a dark room
  • A timegrapher, or a watchmaker who owns one

Case, dial and crystal checks

  1. Ask for daylight macro photos of the dial, caseback and movement, plus a short video of the seconds hand sweeping.
  2. Measure the case with calipers. The diameter and thickness should match IWC's published figures for the reference; extra girth usually means a thicker aftermarket movement inside.
  3. Examine the dial printing at 10x. Genuine IWC text is crisp, spaced correctly and sits flat on the lacquer. Replica text shows soft edges, uneven letter spacing and ink that sits proud of the surface.
  4. Check the applied numerals and hour markers for polish and seating. Genuine markers sit flush and reflect light the same way across the set.
  5. Charge the lume with the UV torch for 20 seconds and kill the lights. Genuine Super-LumiNova glows evenly across markers and hands, then fades over several hours. Replicas glow patchy, flare bright at first and die inside an hour.
  6. Inspect the date aperture. The cut should be clean, the disc flat behind it, the numeral centered and the print sharp. A crooked or off-center date wheel is the most common replica fault on this model.
  7. Look at the crystal from a low angle. The sapphire carries antireflective coating on both faces, so reflections are faint and neutral. A blue or purple sheen means single-sided coating.
  8. Read the caseback engraving with the loupe. Reference number, serial and the Probus Scafusia mark should be cut deep with crisp edges and consistent depth across every character.
  9. Cross-check the serial on the caseback against the paperwork and the movement. A serial that appears in two different listings is a batch flaw, not a coincidence.

Movement and running checks

  1. Look through the exhibition caseback at the rotor engraving. Genuine IWC lettering is cut into the metal with visible depth; replica engraving is laser-etched, shallow and often the wrong typeface.
  2. Study the bridge finishing and screw heads. You want even graining, clean bevels and screw slots that are properly cut and undamaged.
  3. Wind the crown about 40 turns, set the time and leave the watch alone for four days. It should still be running with sane accuracy at the end. If it stops on day two, the reserve is not 120 hours.
  4. Listen while you shake the watch gently. A rotor that rattles or free-spins noisily points to a low-grade automatic module.
  5. Check the winding feel and the crown threads. Both should be smooth, with no grit and no wobble in the stem.
  6. Put the watch on a timegrapher in several positions. A healthy 32111 holds a tight rate band and stable amplitude; a replica typically drifts 15 to 30 seconds a day with uneven amplitude.

Red flags

  • Seller will not supply macro photos of the movement or a running video
  • Price far under the going rate for a used example of the reference
  • Listed as new without box, papers or warranty card
  • Hands that miss the 12 o'clock index when the time is set
  • Strap hardware that is stamped rather than engraved
  • Payment demanded by wire or crypto only, with no inspection period
  • Caseback engraving that looks painted or sandblasted instead of cut

What the price should tell you

A steel IWC Pilot's Watch Automatic 41 trades in the low four figures used, and fakes sell for a few hundred dollars. Treat any offer that lands between those two numbers, with vague history and no service record, as a watch to walk away from. Weighing the watch does not help: replica makers now use real steel cases, so heft is a weak signal and movement behavior is the strong one.