Short Answer

A fake IWC 329104 gives itself away in the details, not the silhouette. The genuine Pilot's Watch Mark XVIII uses a 40 mm case and IWC caliber 35111, a Sellita SW300-1 base that beats at 28,800 vibrations per hour with a 42 hour power reserve. Counterfeits copy the outline and miss the dial print, the date wheel font, the crown engraving, the caseback stamps, and often the beat rate. Check those five points under 10x magnification, then confirm the serial with IWC or an authorized service center before you pay.

Prerequisites

  • A 10x loupe or a phone macro lens
  • A timegrapher reading, or a watchmaker who will run one
  • Clear photos of the genuine reference for side by side comparison
  • The seller's serial number, reference number, and warranty card, in writing

Check the Dial Print

  1. Place the loupe over the brand text at 12 o'clock.
  2. Compare the stroke weight of each letter to a genuine photo. Genuine printing holds a constant width. Replica printing shows thick and thin strokes inside the same word.
  3. Look at the gap between the brand name and the city name. Counterfeits space it wide or crowd it.
  4. Check the minute track. Genuine markers are sharp with even spacing, replicas smear at the edges.
  5. Turn the dial toward a light source and study the lume on the numerals. Genuine lume sits level inside the printed outline. Replica lume overflows or sits low.

Inspect the Date Window and Hands

  1. Look at the date aperture rim. Genuine apertures are cut clean with a crisp inner edge.
  2. Check the date font. Replicas use generic date wheels with wider digits and different stroke ends.
  3. Compare hand length and the shape of the tip. Genuine hands reach the minute track without touching it.
  4. Watch the seconds hand sweep past 12. A stutter or a tick points to a cheap movement.

Examine the Case, Crown, and Caseback

  1. Measure the case with calipers. Genuine cases measure 40 mm across the bezel. A shell that lands more than 0.3 mm off is suspect.
  2. Check the crown engraving with the loupe. Genuine crowns carry a deep, centered logo with sharp edges.
  3. Study the brushing on the lugs. Genuine brushing runs in one direction with consistent grain. Replicas show swirl marks and broken lines.
  4. Read the caseback engraving. Genuine stamps are cut deep with clean letterforms. Laser etched replicas look shallow and gray.
  5. Match the reference and serial on the caseback to the numbers on the papers.

Test the Movement

  1. Ask for a timegrapher reading in six positions, or pay a watchmaker for one.
  2. Confirm the beat rate. Caliber 35111 runs at 28,800 vph. A reading of 21,600 vph means the watch holds a Miyota or a low grade clone, not an IWC caliber.
  3. Check the power reserve. Wind the watch to full power, set it down, and note when it stops. A genuine 35111 runs close to 42 hours.
  4. Test the quick set date and the hacking seconds. Both should work with a light touch on the crown.

Verify Serial Numbers and Paperwork

  1. Ask the seller for the full serial and reference in writing before you meet.
  2. Call IWC or an authorized service center and request a check against the reference.
  3. Match the warranty card, the caseback, and the movement number.
  4. Walk away if the seller refuses a serial check or rushes the sale.

Fast Red Flags

  • A price far below the used market for the reference
  • No serial number in the listing photos
  • Blurry photos of the caseback and crown
  • Papers on thin stock with mismatched fonts
  • A seller who meets in a parking lot and takes cash

If You Already Bought a Fake

  1. Stop wearing the watch and keep it in the condition you received it.
  2. Save the listing, the messages, and the payment record.
  3. Report the sale to the platform and to your payment provider.
  4. File a report with the FTC and your state attorney general. Selling counterfeit goods is illegal in the United States.