Short answer
On a fake IW323757, the dial usually looks fine. The case and bracelet do not. Replica makers nail the printing and the applied markers because those are easy to copy from a photo. What they miss is the geometry: the mid-case bevel, the taper of the bracelet links, the way the end links sit against the lugs, and the depth of the engraving on the caseback. If you only have two minutes and a phone camera, spend them on the bracelet edges and the caseback text, not the dial.
What this watch is, and why it gets copied
The IW323757 sits in IWC's Ingenieur Automatic family, the steel sports line with the Genta-influenced design language: a flat bezel, a broad brushed case, an integrated-looking bracelet and a restrained dial. It is exactly the kind of watch replica factories like. Simple dial, no chronograph, no moonphase, nothing exposed. Few complications on the front, so almost all of the cost of a good fake goes into the case, and that is where the shortcuts show up.
It also has a closed caseback, which is a gift to counterfeiters. Nobody can see the movement from outside. They can drop in a stock automatic, engrave a reference number on the back and call it a day.
Dial and printing
- Print weight. Genuine IWC text is thin, sharp and consistent, including the smallest lines. Fakes often print slightly heavy, and the edges look soft under a loupe.
- Script. The "International Watch Co." lettering has a specific slant and stroke contrast. Compare letter shapes, not just the words. Look at how the letters connect.
- Applied markers. They should be flat on top, polished on the sides, with lume filled to the same level in every marker. Uneven fill, or fill sitting proud of the frame, is a bad sign.
- Date window. The cut should be crisp with a clean bevel. Fakes often have a slightly rounded edge, and the date disc print looks thin.
- Rehaut and chapter ring. Alignment should be perfect all the way around. Any drift near 6 or 12 o'clock is a tell.
Then charge the lume under a light for a minute and look again in the dark. Genuine lume fades evenly. Cheap lume fades in patches.
Case and bracelet, where most fakes fall apart
I start at the lugs. On a genuine case, the brushed surface is even and the polished bevel is a straight line with a sharp transition. On fakes, that transition is often rounded or polished too wide, because that is easier to do by hand.
Then the bracelet. Look at the link edges under a bright light: they should be crisp with a consistent chamfer, and every link should share the same profile. Squeeze the bracelet and listen. Genuine bracelets are tight and quiet. Loose, rattly links on a watch sold as new are wrong.
End link fit is the single best test. There should be no gap, no step and no wobble where the end link meets the lugs. Replica end links usually sit slightly proud, or leave a hairline shadow you can catch with a fingernail.
Check the clasp engraving too. It should be deep, crisp and correctly spaced. Fakes are often laser etched and look shallow and grey rather than cut.
Caseback, serial and engraving
Reference numbers and serials are engraved, not printed, and you should be able to feel the edges with a fingernail. Fake engraving is typically shallower and slightly wider, with rounded corners inside the letters.
On the inside of the caseback, genuine finishing is clean: even perlage, no machining marks left behind, and a gasket that sits flat in its groove. If a seller will not let you or a watchmaker open the back, that is your answer.
Serial placement and font matter as well. Compare the digits to a known genuine example of the same reference, not to a different Ingenieur.
Hands, crystal, crown
Hands should be flat, well polished and cut cleanly at the base. Look at where each hand sits over the markers: the height above the dial should be consistent. Fakes sometimes sit too high or too low.
The crystal should be clear with an even edge and no cloudy halo at the rim under angled light. The crown should thread smoothly, with a firm stop. Gritty threading on a modern IWC is not normal.
Weight and feel
A steel 40mm sports watch on a full bracelet normally lands somewhere in the 140 to 170 gram range, depending on the exact version and how many links are fitted. Fakes are often noticeably lighter because the bracelet is hollow, or heavier because the case is over-built. Weigh it if you can, and compare with the number of links the seller says are fitted.
Papers, price and the questions to ask
Box and papers help, but they are also the easiest thing to fake. What actually matters: a service record from an authorized service center, the warranty card with a serial that matches the case, and a seller who will meet at a watchmaker for an inspection.
Price is a filter. If a steel Ingenieur Automatic is offered well under the normal secondary market band for the reference, assume something is off until proven otherwise. Nobody sells a genuine watch at a fake's price by accident.
Red flag checklist
- Dial printing that looks heavy or fuzzy at 10x.
- End links that do not sit flush against the lugs.
- Bracelet screws with soft heads or the wrong slot width.
- Shallow caseback engraving with rounded letter interiors.
- A seller who refuses an inspection or an open caseback.
- A price far below the market band for the reference.
- Photos that are all low resolution or heavily filtered.
Bottom line
A fake IW323757 is usually caught on the outside, not the inside. Case finishing, bracelet geometry and engraving depth are the three things a replica factory cannot make cheap and get right. Check those first, get the watch opened by someone qualified, and treat a too-good price as information rather than luck.