Top pick: the Swiss-movement super clone of the IW371482. It wins on four criteria that decide every other tier: movement architecture (a 7750-family automatic driving a working two-register chronograph), dial and subdial geometry, case and crystal finishing, and caseback engraving depth. Below is a short brief on the reference, a tier-by-tier comparison with pros and cons, and a checklist you can run against seller photos or a watch in hand.

What the IW371482 actually is

The reference belongs to the IWC Portugieser Chronograph family, a two-register automatic chronograph. Running seconds sit at 6 o'clock, chronograph minutes at 12, and the date window at 3. The case is stainless steel with a polished bezel over brushed flanks, the dial carries applied numerals and feuille (leaf) hands, and the movement group is the Valjoux 7750 base that IWC reworked and finished for this generation. Those five facts are the spine of every authentication check that follows. Any build that moves a subdial or adds a third register is not a close copy, no matter how good the listing photos look.

Tier 1: Swiss-movement super clone

This is the build that matches the original on the parts people check first: crown position, pusher spacing, subdial centers, date aperture, and a display back with a decorated automatic movement behind it.

  • Pros: correct two-register layout with the date at 3; sweeping seconds at 6; decorated bridges and an engraved rotor visible through the caseback; crisp applied numerals; sapphire crystal with anti-reflective coating on both faces; brushed and polished case transitions that hold up in daylight.
  • Cons: highest cost of the three tiers; finishing under a loupe still differs from a genuine IWC; older reference numbers sell out and restock on a schedule you do not control; service options depend on where you live.

Best for: daily wear, travel, and any setting where the watch gets handled or photographed up close.

Tier 2: Asian 7750 build

  • Pros: still automatic, so the seconds hand sweeps; subdial layout and date position can be correct; case dimensions close to the original; costs far less; parts and servicing are easy to arrange in most markets.
  • Cons: thicker mid-case and caseback on many batches; rotor noise; weaker anti-reflective coating; heavier dial print; shallow caseback engraving; date wheel font can be off by a hair.

Best for: a first replica or a second watch you wear hard and do not baby.

Tier 3: quartz and budget auto

  • Pros: lowest cost; keeps accurate time; fine as a display piece or a prop for photos.
  • Cons: a ticking seconds hand is the fastest tell on an automatic chronograph; pushers may be decorative; subdials can be frozen; case edges look soft; the display back shows a plain plate or printed decoration.

Best for: costume use only. Do not wear it near anyone who knows the reference.

How to spot a fake IW371482: the checklist

  1. Subdial positions: running seconds at 6, chronograph minutes at 12. A third register, or a 9 and 3 layout, is wrong for this reference.
  2. Date at 3, black numerals on a white disc, sitting centered in the window.
  3. Seconds hand at 6 sweeps in small steps. A one-per-second tick means quartz.
  4. Pushers at 2 and 4 start, stop, and reset the chronograph, and reset snaps back to zero. A pusher that does nothing is a fake detail.
  5. Applied numerals with a polished bevel and a clean edge. Flat stamped metal or printed hour markers are a downgrade.
  6. Dial text: letterforms, weight, and spacing of the brand name and the country line. Fuzzy edges show up under a loupe.
  7. Crystal: sapphire with coating on both faces shows a faint blue or purple tint at an angle. Mineral glass reflects more and looks dull.
  8. Case finish: brushed flanks, polished bezel and lug tops, defined transitions. Rounded or soft edges point to a low tier.
  9. Display back: Geneva striping on the bridges, blued screws, an engraved rotor. A blank plate is an instant fail.
  10. Caseback engraving: reference and serial numbers struck into the metal, not laser-etched on the surface.
  11. Strap and buckle: even stitching, alligator grain with a natural pattern, a buckle with engraved branding rather than a blank plate.
  12. Serial consistency: ask for several photos of the caseback and compare the number and the engraving depth across shots.

Questions to ask before you pay

  1. Which movement is inside, and can you send a photo of the back with the rotor visible?
  2. What are the exact case diameter and thickness?
  3. Is the crystal sapphire with anti-reflective coating on both faces?
  4. Is the chronograph fully functional, including reset to zero?
  5. Is the watch in the photos the watch you will ship?
  6. What happens if it arrives with a defect?

Use-case recommendation

For the IW371482, buy the Swiss-movement tier if you plan to wear the watch and want the chronograph to work the way the original does. Choose the Asian 7750 tier if the look matters more than the last ten percent of finish. Skip quartz unless the watch is a prop. This reference is a two-register chronograph with a display back, so the movement behind the crystal and the layout on the dial carry the whole illusion, and those are also the two places cheap fakes give themselves away.