What a Replica IW371427 Is

A replica IW371427 is a copy of the IWC Portugieser Chronograph reference IW371427. The genuine watch is a 40.9 mm steel chronograph with an automatic movement, two subdials, and a date at 3 o'clock. Replica versions sell from about USD 300 to USD 800. Most use an Asian 7750 movement. A smaller share use a Swiss ETA 7750 or a Sellita SW500.

The reference number matters. IWC built the Portugieser Chronograph as a family of references under IW3714. Dial color, hands, and strap change from one reference to the next. Confirm the exact dial and strap for IW371427 on IWC's own product page before you compare it to a replica listing.

Genuine Specs to Compare Against

  • Case: stainless steel, 40.9 mm diameter, about 12.5 mm thick. References in this family differ by a few tenths of a millimeter, so measure the exact model.
  • Crystal: domed sapphire with antireflective coating on both sides.
  • Water resistance: 3 bar, equal to 30 m.
  • Movement: IWC caliber 79350, automatic, based on the Valjoux 7750. Beat rate 28,800 vibrations per hour. Power reserve about 44 hours.
  • Dial: two counters. Chronograph minutes at 12. Running seconds at 6. Date window at 3.
  • Numerals: applied Arabic numerals, not printed.
  • Strap: alligator leather with a steel pin buckle on most versions.

Where Replicas Differ

Subdial layout is the first check. A stock Valjoux 7750 puts the running seconds at 9 and the 30-minute counter at 12. The Portugieser layout moves the running seconds to 6. A replica needs a modified movement, extra gears, or a printed fake counter to show that layout. Extra gears add drag and add failure points.

Case thickness is the second check. Replica cases often run 1 mm to 2 mm thicker than 12.5 mm because of the movement spacer and the caseback shape.

Other common gaps: mineral glass in place of sapphire, weak or missing AR coating, printed numerals in place of applied, shallow caseback engraving, and a plated brass case that weighs less than steel.

Movement Tiers

  1. Asian 7750. About USD 300 to USD 600. Beat rate 21,600 or 28,800 vph depending on grade. Chronograph start can feel abrupt.
  2. Swiss ETA 7750 or Sellita SW500. About USD 600 to USD 1,200. Smoother pusher feel and parts that independent watchmakers can service.
  3. Genuine IWC 79350. IWC does not sell this caliber as a spare part. It reaches the market inside a genuine watch or through IWC service. A listing that claims a new genuine 79350 inside a replica is false.

Inspection Checklist

  1. Ask the seller for a photo of the movement and a timing machine reading: rate in seconds per day, amplitude in degrees, beat error in milliseconds.
  2. Measure case thickness. Genuine is about 12.5 mm.
  3. Start the chronograph. The counter at 12 should step once per minute. The seconds hand at 6 should run with the watch, not with the chronograph.
  4. Watch the date change at midnight. It should complete within about 10 minutes.
  5. Check the numerals with a magnifier. Applied numerals show a raised, polished edge.
  6. Ask about water resistance. Most replicas fail a 3 bar pressure test.
  7. Confirm the return window and the payment method in writing.

US Import and Legal Notes

Counterfeit watches are illegal to import into the United States. U.S. Customs and Border Protection can seize a shipment, including one watch sent by mail. Trafficking in counterfeit goods is a federal crime under 18 U.S.C. 2320. Possession by a buyer is not a federal crime in most cases, but selling a replica as a genuine watch is fraud. A replica carries no IWC warranty and no service history.

Price Reference

Used genuine IWC Portugieser Chronograph steel models trade in the low thousands of USD on the secondary market. Box and papers add to the price. Replica pricing sits two orders of magnitude below that. A low price on a listing that claims a genuine watch is the clearest sign of a counterfeit.