Short answer
A replica IW545170 is a copy of IWC's Portugieser split-seconds chronograph, sold on first copy sites under labels like "AAA" or "Swiss made replica." It is not an IWC and it never will be. The case profile, dial layout and strap can look close in photos. The rattrapante function, which is the entire reason this reference costs what it costs, almost never works the way the original does. If you want the look on your wrist, a copy delivers that. If you want the mechanism, it does not.
What the original actually is
The IW545170 sits in IWC's Portugieser line and carries a hand-wound split-seconds chronograph, meaning two seconds hands run together until you press the extra pusher and stop one to read a split time. That pusher normally sits near 10 o'clock. Case size, dial finish and movement details vary by production run, so check IWC's own reference page before you compare anything side by side. Get the baseline right first, then judge the copy against it.
What buyers usually get
Most copies at this reference level fall into one of three tiers. The lowest is a quartz chrono in a plated case, roughly 40 to 45 mm, with printed subdials and a rattrapante pusher that does nothing. The middle tier uses a modified automatic chronograph movement, adds a sapphire crystal and a slightly better dial, and still fakes the split-seconds. The top tier, if a seller offers it, copies the case finishing closely and may run a hand-wound chronograph movement, but true split-seconds at replica prices is rare and I treat any claim of it as a red flag until a video proves it.
What to inspect before paying
- Pusher travel. Press the rattrapante pusher. If the second hand does not stop and restart, the split-seconds is cosmetic.
- Case thickness. Copies run thick because the movement is thicker than the original caliber.
- Dial printing. Look at the subdial rings and the brand text under magnification, not on a phone screen.
- Date font and window position, a common tell on this reference.
- Crystal clarity and anti-reflective coating. Cheap copies flare under indoor light.
- Strap hardware. Spring bars and buckles are usually the cheapest part of the build.
Price and red flags
Expect roughly 80 to 300 US dollars depending on movement and finish. A "Swiss made" stamp on a 150 dollar watch is marketing, not a fact. Sellers who refuse live video, who show only stock photos, or who promise the same watch as the original are the ones to skip. Ask for a timestamped clip of the chronograph running and resetting to zero.
Practical risks
Customs can seize counterfeit goods, and that risk sits with you, not the seller. No IWC service center will touch the watch, and most replica sellers offer no real warranty. Water resistance claims are unreliable, so keep it away from pools and showers. Resale value is close to zero. Buy it as a look, at a price you can lose, and it does the job it was made for.