Answer first

A fake IW544705 duplicate gives itself away in four places: the caseback engraving, the finish of the movement under the display back, the weight and balance of the case, and the paperwork that travels with the watch. A genuine example has crisp recessed engraving, a movement with defined anglage and perlage, and a serial that matches its certificate. Most duplicates fail at least one of these checks, and many fail two.

Before you start

  • A 10x jeweler's loupe
  • Digital scale accurate to 0.1 g
  • Vernier calipers
  • Catalog photos of the reference from the maker's own site
  • A watchmaker who services IWC movements

Procedure

  1. Match the reference digits to the official catalog. Open the maker's own reference page and confirm the model, case material, and case diameter that IW544705 maps to. A seller who describes a different case size or material is describing a different watch.
  2. Measure the case with calipers. Compare the diameter and thickness to the catalog figure. Duplicates tend to run 0.3 mm to 1 mm off, and the error shows at the lugs.
  3. Weigh the watch on the digital scale. Compare against a known genuine example of the same reference and material. A light case points to a plated base metal or a hollowed midcase.
  4. Inspect the dial print under the loupe. Check the brand name, the numeral fonts, and the minute track. Genuine print sits sharp with clean edges; duplicate print shows ink spread, uneven weight, or a fuzzy outline on thin strokes.
  5. Check hand finish and alignment. Look at the bevel of each hand and confirm the hour hand lands on the index at each hour. Sloppy bevels and off-center hand fitting are common on duplicates.
  6. Read the caseback engraving under the loupe. Genuine engraving has depth, a V-shaped cut, and crisp edges. Laser dot-matrix engraving, shallow lettering, or a reference number stamped in a different font is a fail.
  7. Study the movement through the display back. Look for beveled bridges, even perlage, blued or polished screws, and a rotor or bridge engraving that matches the reference. Undecorated bridges, plastic parts, or a movement number that does not belong to the reference means the watch is not original.
  8. Wind and set the watch. Turn the crown through a full wind and set the time forward past midnight. Genuine keyless works feel tight and consistent; a duplicate feels gritty or slips.
  9. Compare the serial on the caseback to the certificate. The digits must match exactly, in the same font, with no over-stamping or hand-scratched correction.
  10. Have a watchmaker open the case. Ask for a written opinion that names the movement caliber and states whether it is original to the reference. This is the only check that settles the question.

Red flags that end the deal

  • Price far below the current market for the reference
  • Seller refuses an in-hand inspection or a watchmaker's opening
  • Photos that hide the caseback or the movement
  • Papers with mismatched serials or a reprinted warranty card
  • Caseback engraving you can feel with a fingernail catching on the edges

What to do with the result

Two or more failed checks is enough to walk away. One failed check, such as worn hands on an otherwise correct watch, is a service issue rather than a fake, and it belongs in the price negotiation. Record your measurements and photos before you return a watch, since a seller who shipped a duplicate will often dispute the condition on arrival.