Short answer
A fake IW545105 gives itself away in four places: the reference and serial engraving between the lugs, the dial printing under magnification, the finish of the movement through the display back, and the paperwork that ships with the watch. Work through those in that order and most replicas fail before you reach the fourth check. The case and bracelet are the easiest parts to copy. The text and the finishing are not.
What you need before you start
- A 10x loupe, or a phone macro lens with a steady rest.
- Digital calipers that read to 0.01 mm.
- Good raking light, ideally a single desk lamp you can angle across the surface.
- Reference photos of a known-genuine IW545105 at macro scale.
- A timegrapher, if you can borrow one.
The check, step by step
- Turn the watch over and read the engraving between the lugs with the loupe. Look for depth, sharp inner corners, and a consistent baseline. Laser engraving on replicas looks shallow and slightly frosted.
- Measure the case diameter and thickness with the calipers and compare both numbers to the published specification. Replica cases run thick by 0.2 to 0.6 mm more often than not.
- Inspect the dial printing at 10x. Genuine text sits on a clean, sharp edge with no halo. Replica print shows ink spread, uneven letter spacing, or a faint shadow where a pad-printing plate slipped.
- Check the applied markers and hands under raking light. Look for flat polishing on the bevels, crisp facet lines, and no tool marks at the base of each marker.
- Examine the crown logo. Genuine relief engraving has a defined rim; replica crowns show a soft, rounded edge.
- Open the display back and look at the movement plate. Check that the decorative finish runs in continuous, evenly spaced lines and that the engraving on the bridges is cut, not stamped.
- Compare the movement layout to reference photos. Replica makers decorate a stock movement with plates that mimic the genuine architecture, and the giveaway is a bridge screw that lands in the wrong place.
- Run the watch on a timegrapher and note rate, amplitude, and beat error. Wild numbers on a watch sold as freshly serviced are a warning sign.
- Weigh the watch. A difference of several grams against a published figure points to a different case material or a thinner caseback.
- Read the warranty card, the booklet, and the hang tag. Compare fonts, paper stock, and stamping against a known set.
Where replicas fail most often
- Engraving depth between the lugs, which is nearly always shallower than genuine.
- Dial print spacing, especially on small text below the center.
- Movement decoration that looks busy but has no logical layout.
- Caseback threads and gasket seating, which feel rough when you unscrew the back.
- Strap stitching density and buckle engraving depth.
The paperwork test
Paperwork is where a good replica can still be caught. Genuine cards are printed on stock with a visible fiber texture, and the serial on the card matches the serial on the case to the digit. Replicas often reuse a single serial across a batch, so ask the seller for a photo of the caseback and the card side by side. If the seller refuses, stop there.
Fake IWC IW545105 Cost: What Replicas Really Sell For
When to walk away
Walk away if the price sits far below the market for a genuine example, if the seller cannot produce a macro photo of the lugs, or if the watch is offered with no service history and no box. Any one of those is enough. Two of them together means you are looking at a replica dressed up with a story.