The genuine reference

IWC builds the Portugieser Chronograph ref. IW371634 in a steel case of 41 mm. Two subdials sit at 12 and 6, and the date window sits at 3. The movement is calibre 69355: self-winding, 46 hours of power reserve, 28,800 vph. Steel Portugieser Chronograph references list above $8,000 on IWC's site.

Fake IW371634 Buying Guide: Replica IWC Portugieser Checks

Replica buyers chase three things on this reference: case thickness, subdial layout, and dial print. The rest is detail.

Fake IW371634: Your Ultimate Guide to replica Watch Online

Top pick: ZF

ZF is the first name in most listings for this reference, and the numbers support it. Sellers state 41 mm across and 13 mm thick. The genuine case height sits near 13 mm. Subdials land at 12 and 6, with running seconds at 6 and a 30-minute total at 12. The movement is a decorated 7750 base built to copy the 69355 layout, hidden behind a closed caseback. Price band in listings: $358 to $398.

more on this topic

What to inspect on a ZF

  • Date font at 3. The genuine numeral is thin and tall. Wide numerals mean a lower-tier dial.
  • Subdial hand length. Hands should reach the minute track, not stop short.
  • Crystal coating. Look for double anti-reflective coating on both faces and no blue tint.
  • Caseback engraving depth. Shallow laser etching shows under a loupe.

Second option: APSF

APSF runs $318 to $348. Dial print is the strong point. Case finishing is the weak point: lugs show softer edges than ZF under side light. Subdial spacing is correct. Ask for a macro photo of the rehaut at 12 to check print alignment.

fake iw371634 best

Third option: budget A7750 builds

Under $220 the layout breaks. A standard A7750 places running seconds at 9, so sellers fit a transfer plate or a dial with faked subdials. Case thickness goes to 14 mm or more. Rotor noise is common. Buy this tier when price is the single constraint.

Six checks before payment

  1. Ask for caliper photos of case thickness at the lugs.
  2. Confirm the subdial at 6 sweeps as running seconds.
  3. Confirm the subdial at 12 resets to zero with the pusher.
  4. Check crown length and logo relief against a genuine photo.
  5. Ask for a macro shot of the dial print at 12.
  6. Ask for a video with sound to judge rotor noise.

Water resistance: treat the watch as splash contact. No replica carries a pressure test.

Verdict

Buy ZF first. Pay the $40 premium. Take APSF if dial print matters more than case edges. Skip the budget tier unless the budget is fixed.