The short answer
Almost every fake IW371422 you will be offered online comes from one of three tiers, and the gap between them shows up in the same five places: case thickness, subdial layout, dial printing, the movement you can see through the caseback, and the strap. Nail those five and the watch reads as a Portugieser Chronograph from across a table. Get the thickness or the subdial spacing wrong and nothing else rescues it. I would rather buy a mid-tier case with a correct profile than a top-tier dial on a thick, slab-sided case.
Fake IW371422 Guide: How to Spot One and Pick a Replica
What the real reference is
IW371422 belongs to the Portugieser Chronograph 3714 family, a 40.9 mm steel chronograph with a slim bezel, leaf hands, a railroad minute track, and a two-register layout: chronograph minutes at 12, running seconds at 6, date at 3. The genuine uses the 79350 caliber, which is a heavily reworked Valjoux 7750 running at 28,800 vph. Case thickness is the number to memorize, roughly 12.3 mm. Most 3714 versions have a sapphire display back, so the movement is not hidden from anyone who asks.
One caveat before you compare: IWC uses the reference suffix to denote dial, case metal, and strap combinations. Confirm the exact dial color and index style for 371422 against a dealer or auction listing before you judge a replica as wrong. Plenty of buyers call a correct detail a flaw because they were looking at a photo of a different suffix.
The three tiers you will encounter
- Budget tier, under about $150. Usually a quartz or a low-beat automatic, printed subdials, a case that runs 14 mm or more, and a caseback with shallow laser engraving. Skip it unless you want a prop.
- Mid tier, roughly $250 to $450. Asian 7750 clone, decent dial printing, correct 12 and 6 layout, but a thick caseback and a strap that feels like cardboard.
- Top tier, roughly $500 to $800. Modified 7750 with the right subdial positions, applied indices, AR-coated sapphire, engraved rotor, and a proper alligator-pattern strap. This is where the comparison actually gets interesting.
Side-by-side checkpoints
Case and crystal
Ask for a caliper photo across the caseback. Anything past 13 mm is a tell you cannot fix later. Look at the lug curve too. Genuine lugs bend down toward the wrist in a smooth arc, and cheap cases cut them straighter, which makes the watch sit high. On the crystal, genuine AR coating is subtle. A strong blue or purple reflection under indoor light usually means a single-layer coating on a replica.
Dial and hands
This is where I spend the most time. Check the subdial spacing first: the gap between the 12 and 6 registers should look generous, with clean dial space around the date window. Replicas that reuse a stock 7750 layout sometimes blank off the 9 o'clock position, and you can catch a faint raised disc there in a raking-light photo. Then look at the printing. The fine minute track should be crisp at macro distance, not a dotted blur. Hands should be polished leaf shapes with a clean center crease, not stamped flat metal.
Movement
Pop the back. The 79350 base means a 28,800 vph beat, so the chronograph seconds should sweep smoothly and reset to zero without a wobble. Listen to the rotor: a faint, dry whir is normal, a loud rattle is not. Check the engraving on the rotor and bridges for depth. Laser etching looks gray and flat; engraving catches light.
Strap and hardware
Genuine straps are alligator with a signed buckle or deployant. Replicas use embossed calf that creases badly within a month. Budget for a replacement strap on any tier, and factor that into the price comparison.
Red flags in a listing
- Only stock or catalog photos, no macro shots of the subdials or caseback.
- Claims of "Swiss made" or genuine movement at replica prices.
- No thickness measurement offered when you ask.
- Water resistance claims above 30 m on a chronograph with pushers.
- Pressure to pay off-platform before you see detailed photos.
Questions worth asking a seller
Request a macro of the 12 and 6 registers under angled light, a straight-on caseback photo, a caliper reading, and a short video showing the chronograph start, stop, and reset. Ask whether the date flips instantly or creeps over an hour. A seller who answers all five with fresh photos is usually working with a real watch in hand. One who sends the same three pictures again is not.