Quick answer

The IW371446 is the reference number for the IWC Portugieser Chronograph in stainless steel. The genuine watch has a 40.9 mm case, a silver-plated dial with blue hands and appliques, a black alligator strap, and caliber 79350. Replica versions sell from about $80 to $450. Movement, case finish, and strap are where copies differ from the original. No replica matches an IWC part for part.

Genuine IW371446 specifications

  • Case: stainless steel, 40.9 mm diameter, 12.3 mm thick
  • Dial: silver-plated, blue steel hands, blue appliques
  • Subdials: elapsed minutes at 12 o'clock, small seconds at 6 o'clock
  • Movement: caliber 79350, automatic chronograph, 28,800 A/h, 44 hours of power reserve
  • Crystal: convex sapphire, antireflective coating on both sides
  • Water resistance: 3 bar
  • Strap: black alligator leather, steel pin buckle

Caliber 79350 is a Valjoux 7750 base that IWC reworked. The small seconds hand sits at 6 o'clock instead of the 9 o'clock position of a stock 7750. That change is the main reason a replica dial is hard to copy.

Movements used in replicas

Three movement types appear under the IW371446 name.

  1. Quartz. Battery powered. Subdials often do nothing or run as 24-hour indicators. Cases measure 39 mm to 42 mm. Price runs $60 to $120.
  2. Asian 7750 copies. Automatic, 28,800 A/h. Subdial spacing and date position differ from the 79350. Price runs $150 to $280.
  3. Modified 7750 or Seagull based movements with a relocated seconds hand. These come closest to the 6 o'clock subdial layout. Price runs $300 to $450.

A stock 7750 has three subdials. Replica dials hide the 9 o'clock counter under the dial plate, or move the hand with a module. The module adds thickness. Many copies measure 13.5 mm to 14 mm against the 12.3 mm of the original.

Price tiers

  • Under $120: quartz, plated case, mineral glass, printed markers.
  • $150 to $280: Asian 7750, 316L steel case, sapphire with a weak antireflective coating, leather strap that is not alligator.
  • $300 to $450: better case machining, closer dial printing, sapphire on both sides, decorated rotor.

Labels such as "1:1" and "first copy" come from sellers. No grading body issues them. Two sellers use the same words for watches at different quality levels.

Inspection points

  • Measure the case with calipers. 40.9 mm is the target.
  • Check subdial spacing. The gap between 12 and 6 should match photos of the genuine dial.
  • Check the date window. Font, size, and position are common tells.
  • Compare pusher shape and crown engraving with reference photos.
  • Check the crystal coating. Genuine sapphire shows a blue or purple tint at an angle.
  • Check the strap. Genuine straps are alligator with a set buckle stamp.
  • If the caseback is transparent, compare rotor finishing and bridge engraving. Stock 7750 parts look different from the 79350.

Legal position in the United States

Counterfeit watches infringe trademarks. Import is barred under US customs rules, and CBP can seize a shipment. Trafficking in counterfeit goods is a federal offense under 18 U.S.C. 2320, with fines and prison terms in the statute. A replica carries no IWC warranty and no service history. IWC will not service or verify a counterfeit watch.

Verification facts

Genuine IW371446 watches carry a serial number on the caseback and a matching record with IWC. Service papers and a box with the correct reference sticker add value on the resale market. A seller who cannot give a serial number or a service record is a seller of a copy or of a watch of unknown origin.