A fake Portuguese Chrono is a replica of the IWC Portugieser Chronograph, a two-register watch with a 30-minute counter at 12 o'clock, small seconds at 6, a case around 41 mm wide, and no date window. A replica is worth buying only when it copies that layout, keeps the case height close to the real 13 mm, and runs a genuine chronograph movement. Dial print, strap stitching, and box contents matter far less, because those are the parts you can see and judge for yourself before money changes hands.

The Real Watch You Are Copying

Judge a replica against the genuine specifications, not against photos of other replicas.

  • Case: stainless steel, roughly 41 mm across and 13 mm thick.
  • Dial: two subdials on the vertical axis. 30-minute counter at 12, small seconds at 6.
  • Hands: leaf shaped, with a thin needle hand on the running seconds subdial.
  • Current movement: IWC Calibre 69355, automatic, in-house, about 46 hours of power reserve.
  • Older references: Calibre 79350, built on the Valjoux 7750.
  • Water resistance: 30 meters. Treat the watch as splash resistant only.
  • Crystal: sapphire, domed.
  • Caseback: solid, with engraved reference and movement markings.

Three Replica Tiers

Tier 1: Decorative Chronograph

A quartz watch with printed or glued subdials. The pushers do nothing. These are spotted in one glance because the subdial hands never move.

Tier 2: Mid Grade Automatic

An automatic movement, but the subdials sit at 9 and 3, or a date window appears at 3, or the case runs 15 mm thick. The layout is wrong, and the profile gives it away on the wrist.

Tier 3: High Grade 1:1

Correct 12 and 6 subdials, a modified 7750 with a seconds-at-6 transfer, sapphire crystal, engraved rotor, and a case height within a millimeter of the real watch. This is the tier worth comparing side by side with reference photos.

How to Inspect One: Nine Steps

  1. Measure the case across and top to bottom with calipers. Write the numbers down before you look at any photos.
  2. Check the subdial positions. They must stack vertically at 12 and 6, with no date window anywhere on the dial.
  3. Start the chronograph and watch the top subdial hand. It should sweep and count minutes as real time passes.
  4. Watch the bottom subdial for ten seconds. A stuttering or stopping seconds hand points to a worn transfer gear.
  5. Reset the chronograph. The center hand and the 30-minute counter must both snap back to zero.
  6. Press the pushers. Genuine action is crisp with short travel. Mush, grind, or a pusher that sticks is a fail.
  7. Inspect the dial under a loupe. Compare logo thickness, the Schaffhausen line, and applied numeral weight against reference photos.
  8. Tap the crystal and check the edge reflection. Sapphire reads sharp, mineral reads slightly gray and scratches at the edges.
  9. Turn the watch over. Compare engraving depth, font, and rotor finish to photos of the genuine caseback.

Why the Movement Sets the Thickness

The Valjoux 7750 keeps its running seconds at 9 o'clock. Moving that hand to 6 on a Portuguese Chrono requires an extra transfer gear and a plate, which adds height and friction. Inexpensive builds skip the plate and put fake subdials on a plain automatic, so the chronograph never works. Better builds accept the extra gear and land near 13 mm. The best builds use a slimmer base or a quartz hybrid, but the trade off is a chronograph feel that never quite matches a mechanical column wheel.

Red Flags

  • Subdials at 9 and 3, or any date window.
  • Case thickness above 14 mm.
  • A center chronograph hand that moves but never resets to zero.
  • Painted subdial rings with no recessed edges.
  • Mineral glass sold as sapphire.
  • Seller photos that never show the caseback or the movement.
  • Water resistance claims above 30 meters.

Questions to Send the Seller

  • Which movement is inside, and what is the power reserve?
  • What are the measured case diameter and thickness?
  • Does the 30-minute counter at 12 actually advance?
  • Is the crystal sapphire, and is it domed?
  • Can you send a short video of the chronograph starting, running, and resetting?

Ask for the video first. A working chronograph with correct subdial spacing and a thin profile tells you more about a fake Portuguese Chrono than any spec sheet.