What a Fake Portuguese Chrono Is
A fake Portuguese chrono is a copy of the IWC Portuguese Chronograph, the two-register chronograph IWC has sold since 1998 as reference 3714 and now as reference 3716. The real watch carries a 40.9 mm or 41 mm case, leaf-shaped hands, applied Arabic numerals, and two subdials stacked one above the other at 12 and 6. A replica copies that shape. Build quality runs from a cheap quartz knockoff to a Swiss-movement unit that costs several hundred dollars. The steps below show you which one you are holding.
Prerequisites
- Macro photos of the dial, caseback, and movement, or the watch in hand under strong light
- Digital calipers for case, lug, and thickness measurement
- Reference photos of a real 3714 and a real 3716 dial
- A 10x loupe for dial print and hand finish
- A kitchen scale with 1 gram resolution
How to Vet a Fake Portuguese Chrono
- Measure the case diameter with calipers. The 3714 measures 40.9 mm and the 3716 measures 41 mm. Anything under 40 mm or over 42 mm is off spec.
- Measure the case thickness. The 3714 sits at about 12.3 mm. A quartz replica is thin, often under 10 mm, because the movement needs less room.
- Check the subdial positions. The small seconds sits at 6 o'clock and the chronograph minutes counter sits at 12 o'clock. On many fakes the two subdials sit too far apart or crowd the center pinion.
- Read the dial print under the loupe. Look for the IWC wordmark and SCHAFFHAUSEN under 12. Edges on a good dial are sharp. Edges on a bad one bleed into the lacquer.
- Inspect the numerals and hands. Applied numerals show a raised edge and a polished bevel. Leaf hands taper to a point with no burr on the tip.
- Start the chronograph and watch the seconds hand sweep. A mechanical chrono sweeps in a continuous arc. A quartz fake ticks in one-second jumps.
- Press the pushers. They should feel firm with a short travel and a clean click. The reset should snap the hands back to zero in one motion, with no drift.
- Turn the watch over and study the caseback. The sapphire display back shows the movement. Check the rotor engraving and the depth of the case engravings.
- Identify the movement. The 3714 uses a 79350 based on the Valjoux 7750 layout with a 44-hour reserve. The 3716 uses the 69355 with a column wheel and a 46-hour reserve. A decorated rotor over a plain plate points to a low-tier build.
- Weigh the watch. A steel Portuguese chrono on a leather strap lands near 80 to 95 grams. Fakes come in light because the case walls are thin.
- Examine the strap and buckle hardware. Stitching should be even and the buckle tang should sit square in the frame.
- Compare the crown to a reference photo. The crown is fluted, sized to the case, and sits flush against the mid-case with no gap.
Common Red Flags
- Subdial hands that do not align at zero after a reset
- Date window on a model that never had a date
- Mineral glass with a visible edge instead of sapphire
- Printed numerals instead of applied numerals
- A rotor that spins with a rattle when you tilt the case
Quality Tiers at a Glance
- Low tier: quartz movement, mineral glass, printed dial, hollow case
- Mid tier: Asian automatic chronograph, sapphire glass, applied numerals, weak pusher feel
- High tier: Swiss or clone Swiss chronograph movement, correct case size, sharp dial print, firm pushers
Work through the list in order and stop at the first failure. Case size and subdial layout catch most bad replicas before you reach the movement.