The best replica IW3714 copies three things: a 40.9 mm case, a two-register dial with the chronograph minutes at 12 and the small seconds at 6, and a date window at 3. Case thickness, subdial spacing, and movement type decide the rest. Replicas fail on those three points more than on any other detail.
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What the genuine watch measures
IWC publishes the Portugieser Chronograph ref. IW3714 at 40.9 mm across and 12.3 mm thick. The movement is Caliber 79350, a Valjoux 7750 base with a 44 hour power reserve. Water resistance is 30 m. The dial carries two subdials and a date at 3. The crystal is sapphire. Gold and steel versions share the case dimensions.
How replica builds differ
- Quartz builds. Low cost. The 6 o'clock subdial is a printed disc or a 24 hour hand. The second hand ticks once per second.
- Asian 7750 builds. Running seconds sit at 9 in the raw movement. Makers add a transfer gear to move the seconds to 6. Subdial spacing lands wider than the genuine dial in most of these.
- Reworked 7750 builds. Makers copy the 79350 plate layout. Subdial spacing lands closer. Case thickness lands near 12.5 mm.
Checks you can run
- Measure thickness with a caliper at the caseback rim. Under 12 mm or over 13.5 mm points to a stock case.
- Look at the gap between the two subdials. On the genuine dial the gap is small and even.
- Check the date font. Genuine uses a flat, wide numeral.
- Press the pushers. A 7750 starts with a firm click and resets with a snap. A quartz build feels soft.
- Read the caseback engraving under a loupe. Laser etch is shallow and gray. Genuine uses deep stamping.
Price bands
Quartz builds sell under $150. Asian 7750 builds sell from $250 to $450. Reworked builds with corrected dials sell from $500 up. Price stops tracking quality at the top end. A $600 build can carry the same movement as a $400 build with a better dial.
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What you give up
A replica has no warranty and no service path from IWC. Parts supply depends on the seller. Water resistance is unproven, so keep the watch away from water until a watchmaker tests the seals.
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Legal note
Sale of counterfeit watches is illegal in the US and the EU. Customs seizures happen. Buying one carries risk that a genuine purchase does not.