Short answer

Replica IW371601 listings copy the IWC Portugieser Chronograph ref. 3716. The genuine watch uses a 41 mm case, caliber 69355, and 46 hours of power reserve. Copies sell for $80 to $800. None use caliber 69355. Most run a Chinese copy of the Valjoux 7750 or a quartz module. Import into the United States is illegal. Customs can seize the parcel.

What the reference number covers

IWC reference numbers carry six digits. IW371601 sits in the Portugieser Chronograph line. The case measures 41 mm wide and 13.1 mm thick. Sapphire crystal covers the dial and the caseback. Water resistance is 3 bar. Two subdials sit at 12 and 6. A date window sits at 3. The chronograph counts 30 elapsed minutes.

Replica tiers and prices

  • Budget: $80 to $200. Quartz or a 21,600 vph mechanical. Mineral glass. Printed dial markers.
  • Mid tier: $200 to $400. 7750 copy at 28,800 vph. Sapphire glass on some units.
  • Super clone claims: $400 to $800. Sellers claim 1:1. Check the running seconds at 6 and the 30-minute counter at 12.

Checks that separate a copy from the genuine watch

  • Subdial spacing. The 7750 layout shifts the counters. The gap between the two subdials runs wider on most copies.
  • Case thickness. Genuine ref. 3716 measures 13.1 mm. Copies built on a 7750 base reach 14 mm or more.
  • Movement finish. Caliber 69355 has a column wheel and a skeletonized rotor. Copies show a plain rotor.
  • Caseback engraving. Text on copies sits shallow and uneven.

Legal position in the United States

18 U.S.C. § 2320 makes trafficking in counterfeit goods a federal crime. Civil claims fall under the Lanham Act, 15 U.S.C. § 1114. Customs and Border Protection seizes counterfeit shipments at the border. A single personal order can be seized and destroyed. Resale lifts the penalty tier. Statute text and penalty amounts change. Read the current version on the government site.

Price gap as a filter

A genuine steel Portugieser Chronograph costs several times any copy. IWC publishes the retail figure on its own site. If a listing asks 5 percent of that number and shows a 69355 rotor, the photo and the watch do not match.

What is not confirmed

IWC does not publish a parts list for ref. 3716. Dial color and strap codes shift by sub-reference and by year. Verify dial color and strap against the IWC catalog before you compare a listing.