Short answer

A replica IW545109 is a copy of an IWC Portuguese hand-wound watch, and the reference number tells you almost nothing about what will arrive. Two sellers can ship under the same code and hand you very different objects: one with a correctly proportioned steel case and a hand-wound movement with a long power reserve, the other with a plated case and a quartz module hidden behind a decorated plate. Judge the case first, the movement second, and the dial print third. Boxes, papers, and hang tags are the easiest parts to fake.

What the IW545109 is

The code is an IWC reference number. Portuguese-family pieces in this range use a round case around 44 mm wide, a slim bezel, a white or silver-plated dial, applied markers, feuille hands, and a small seconds subdial near 9 o'clock. The genuine watch is hand-wound and holds a long power reserve of roughly eight days, which is why the caseback is sapphire and the movement is worth a look. A copy has to reproduce the silhouette first. Every other detail follows from that.

Before you start

  • Find the published case diameter, thickness, and lug width for the reference you are buying.
  • Get digital calipers and a 10x loupe. Photos alone will not settle a question about proportions.
  • Save three or four high-resolution photos of the genuine watch from different angles.
  • Check the import rules where you live. Counterfeit watches can be seized in transit, and selling one as genuine is a crime.

How to grade a replica IW545109

  1. Measure the case with calipers and write down diameter, thickness, and lug width. Compare each number to the published figure. One millimeter off is visible on the wrist.
  2. Turn the watch in raking light and study the case flanks. The brushing should run one direction, the polished bevels should stay crisp, and the transition between the two finishes should read as a hard line.
  3. Check the lug shape against your reference photos. Lugs that are too thick, too short, or drilled at the wrong angle are the most common giveaway on this reference.
  4. Inspect the dial print under the loupe. Study the subdial ring, the minute track, and the text. Edges should be sharp and the ink should sit flat with no bleeding or fuzzy outline.
  5. Look at the markers and hands. Applied indices should sit level and reflect light in the same way. Feuille hands should taper to a clean point with no burr on the edge.
  6. Confirm the subdial position and hand alignment. The small seconds hand should sweep and the reset point should match the genuine layout, not sit half a minute off.
  7. Ask the seller what movement is inside and request a clear photo through the caseback. A hand-wound movement with a multi-day reserve is the whole point of this watch. A quartz tick or a rotor under the glass tells you how the rest of the build was costed.
  8. Wind it fully and time the reserve yourself. Note the hour on day one, then check each morning after. A claimed eight-day reserve that dies on day three answers the question.
  9. Study the caseback engraving with the loupe. Reference and serial characters should be cut rather than printed, and the font and spacing should match the genuine layout.
  10. Inspect the crystal. Sapphire with an anti-reflective coating should look close to invisible at most angles and show a faint tint at the edge. Plain mineral glass flares and scratches.

Common tells of a low-grade copy

  • Printed subdial rings that blur at the edges.
  • Markers sitting at uneven heights on the dial.
  • Case plating that shows a yellow or copper tone where it rubs.
  • An unsigned or poorly stamped crown that grinds when turned.
  • A caseback sticker instead of engraved text.
  • A strap with the wrong taper and stitching that does not match the original style.

After you buy

Treat water resistance as a claim, not a fact. Have a watchmaker pressure test the case before you wear it near water, and expect the gaskets to be the cheapest part of the build. Swap the strap if it irritates your wrist. If the movement stops or runs fast, a service often costs more than the watch itself, so weigh that cost before you send it anywhere.