Short answer: most IW545116 fakes survive a photo and fail in the hand. The dial layout is the easy part to copy. The case profile, the winding feel and the depth of the small seconds subdial are where the copies come apart.
What the reference actually is
The IW545116 belongs to IWC's Portugieser hand-wound family: a clean dial with a small seconds subdial at six, applied numerals, a slim bezel, and a steel case in the 44 mm range. It runs on a manual movement, and that detail matters more than any other when you are judging a copy. Anything with a rotor can hide behind a closed caseback. A hand-wound watch lives or dies on feel, and feel is hard to counterfeit at a low price.
The five things I check first
- Case flanks. Real Portugieser cases have flat, straight-brushed sides with a crisp line where the brushed surface meets the polished bevel. Copies round that transition off. Run a fingernail along it and you can feel the difference before you see it.
- Lug tips and underside. The genuine lugs taper cleanly and the underside is finished, not left raw. Fakes often have a slightly thicker tip and a softer inner edge.
- Subdial depth and the small seconds hand. On the real watch the subdial is a genuine recess and the hand sits close to the printed track. Cheap copies print the subdial flat or float the hand too high above it.
- Dial text. Look at the "IWC" and the "SCHAFFHAUSEN" line under magnification. Copies tend to run a heavier font weight and uneven letter spacing, and the printing sits slightly proud of the dial.
- Crown and winding. Unscrew the crown and wind it. The genuine action is smooth with steady resistance. A gritty or slack crown is the fastest tell there is.
Movement: where the money goes
Most fakes in this reference use a decorated Asian hand-wound movement. The blued screws are usually painted, the perlage is stamped rather than applied, and the plates are plated rather than solid. You may never see any of that if the caseback is closed, so test behaviour instead. A real hand-wound Portugieser holds a couple of days of power reserve. A cheap copy is often dead by morning. Wind it, set it down, and check it the next day. That test costs nothing and settles most arguments.
Replica is not the same word as fake
Worth being blunt about this. A replica is a copy sold as a copy, at a copy price, with the buyer told what they are getting. A fake is the same object sold as genuine. The IW545116 is a reference where the gap between those two things runs into thousands of dollars, so the word a seller uses tells you most of what you need to know before you look at a single photo.
Price reality check
Genuine examples trade in the low to mid four figures in US dollars on the secondary market, with box and papers pushing that higher. If the offer is a few hundred dollars, it is a replica, and the only question left is whether it is a good one. If the offer is around $1,500 to $2,000 and described as genuine, walk away. That number is built to feel like a bargain rather than a warning.
Before you pay
- Ask for a macro shot of the dial text, not a phone snap from arm's length.
- Ask for a clear photo of the caseback engraving. Laser etching looks shallow and grey next to proper deep engraving.
- Ask for a short video of the watch being wound and the seconds hand running.
- Match any serial on the paperwork against the one on the case.
- Get the seller to state in writing whether the watch is a replica or genuine.
- Pay with something reversible. A bank transfer is not reversible.
None of this needs a loupe or a watchmaker. A fingernail, a day of waiting and a seller who will put the word "replica" in a message will catch almost every bad IW545116 you are likely to meet.