Short answer

The IW371652 is a reference in the IWC Portugieser Chronograph family. Every reference in that block shares one case and one movement: a 41 mm steel case, calibre 69355 automatic chronograph, two subdials, no date window. The digits after IW3716 code the dial color and the strap or bracelet. IWC does not publish a separate spec sheet for each suffix. Confirm the dial color and strap from photos before you compare a replica listing to the genuine watch.

Specs to compare

  • Case: 41 mm diameter, about 13 mm thick, stainless steel
  • Crystal: sapphire front, sapphire display back
  • Water resistance: 3 bar
  • Movement: calibre 69355, automatic, 28,800 vph, 46 hour power reserve
  • Chronograph control: column wheel
  • Subdial at 12: elapsed minutes, 30 minute scale
  • Subdial at 6: running seconds
  • No date, no day, no power reserve indicator

Where replicas diverge

Most faults show up in five places. Ask for close photos of each one.

  • Thickness. Builds that use an A7750 base run 14 mm to 15 mm. The genuine case sits near 13 mm.
  • Subdials. The genuine counters sit in a recess below the dial plane. Flat, printed counters are a common shortcut.
  • Subdial spacing. The gap between the two counters follows the movement, not the case. A wider or narrower gap shifts the whole layout.
  • Print. The IWC wordmark, the Schaffhausen line and the minute track should hold sharp edges at 10x magnification.
  • Pusher feel. A column wheel chronograph starts with light pressure and no jump of the seconds hand. Cam actuated movements feel different.

Price tiers

Chronograph replicas cost more than three hand replicas because the movement costs more. Listings for this family run from about 120 USD to about 700 USD. The spread tracks the movement and the dial work. No public price index exists for this reference, so treat any single quoted price as one seller's number. Ask which movement is fitted and whether the caseback is solid or display.

Checks before payment

  1. Request a photo of the movement through the caseback.
  2. Request the measured thickness with calipers in the photo.
  3. Request a video that starts the chronograph and shows the minute counter at 12 advancing.
  4. Request a photo of the buckle or clasp markings.
  5. Confirm the return window and the return address in writing.
  6. Confirm the strap material and the lug width, which is 20 mm on this case.

Legal status

A watch that carries a registered trademark without authorization is a counterfeit in the United States. Sale and import fall under 15 U.S.C. 1114 and 18 U.S.C. 2320. Customs can seize shipments. Penalties scale with the number of items. Buyers should weigh that risk before paying.