Short answer

A fake IW371461 is a copy of IWC's Portugieser Chronograph, the 40.9 mm steel bicompax model from the 3714 family. The genuine watch runs on calibre 79350, a modified Valjoux 7750, and sells for several thousand dollars on the secondhand market. That gap is why copies are everywhere and why quality ranges from rough to convincing. If you are comparing one, look at five things first: the dial printing, where the two subdials sit, the measured case size, how the chronograph seconds hand sweeps, and the depth of the caseback engraving.

What the real reference is

This family has been in production since the late 1990s and IW371461 sits inside that run, so the core specs hold across most of it. Stainless steel case, 40.9 mm across, roughly 12 mm thick, 20 mm between the lugs, 30 m of water resistance. The dial is a two-register layout with the chronograph minutes at 12 and running seconds at 6, thin feuille hands, and applied numerals and markers. Sapphire crystal with an anti-reflective coating. Inside sits the 79350, an automatic integrated chronograph beating at 28,800 vph with a 44-hour power reserve. Knowing these numbers lets you judge a copy in about a minute.

Dial and hand clues

  • Subdial placement. Two counters only, at 12 and 6. A copy with three counters, or with running seconds at 9, is built on the wrong base movement and will never look right.
  • Printing. The letters in "IWC" should be spaced evenly and stay sharp under a loupe. "SCHAFFHAUSEN" sits below in a lighter weight. Soft edges and thick strokes are the most common giveaway.
  • Subdial rings. The snailing inside each counter should be fine and consistent. Cheap prints look flat or smeared.
  • Hands. The leaf hands are thin, polished, and pointed. Copies often use hands that are a touch too wide or blunt at the tip.
  • Marker alignment. Applied numerals should sit flat with no glue visible along the edges.

Case, crown and pushers

Measure the case instead of trusting a listing. Anything at 42 mm or larger is out of spec, and a case that is too thick throws off the whole profile. The lugs on the real watch are slender and curve downward, with a polished bezel that stays thin. The pushers should have a firm, short travel: one light press starts the chrono, a second press stops it, and the reset returns the hand to zero with a clean snap. Mushy pushers usually mean a quartz module or a cheap cam. The crown is small and signed, and the engraving should be crisp rather than a soft blob.

What is actually inside

This is where first copies split into three groups. A Chinese-made 7750 clone is the good outcome: automatic, 28,800 vph, serviceable by most watchmakers, and correct in both function and feel. A Seagull ST19 is hand wound, so if the watch has no rotor you know what happened. Quartz is the cheap route, and the chronograph seconds hand will tick once per second, which no mechanical chrono does. Watch the sweep for ten seconds. A mechanical movement advances in several small steps per second, and a quartz one jumps.

Weight, strap and buckle

A steel head without the strap should feel substantial, roughly 70 to 80 grams. Too light usually points to an alloy case or a hollow build. On the strap, look at stitch spacing and edge finishing. Buckles of this type are stamped deep with the logo, and the tang should be thick and polished. Thin, bendy hardware is a sign the rest of the watch was assembled to a price.

Questions to ask a seller

  • Which movement is in it, and can you show a photo of the rotor?
  • What is the measured case diameter and thickness?
  • Are both subdials functional, or is one decorative?
  • Does the chronograph reset to zero every time?
  • Can you send a close-up of the dial print and the caseback stamping?

Living with one

A first copy with a 7750 base can run for years, and a service costs far less than the real watch. Quartz copies are reliable but the pusher feel and the sweep are wrong, and that is what people notice first. Treat any water resistance claim as marketing, so keep it away from pools and showers. And a first copy is a copy. It should always be sold as one, never passed off as the genuine article.