The IW371478 is a reference in the IWC Portugieser Chronograph line. Fakes of this model exist at three rough levels: a $250 budget build, a $400 to $500 mid build, and a $700 "super clone" build. The dial at arm's length does not settle the question. The movement, the case thickness, and the case back engraving do.
One caveat on the reference itself. IWC reference numbers in the 3714 series cover several dial and strap combinations. Published listings for IW371478 are thinner than for IW371446 or IW371447. Confirm the dial color, strap type, and case back style against an IWC catalog page or a dealer sheet before you judge a specific watch.
Check the movement first
Genuine Portugieser Chronograph 3714 references run Caliber 79350. That is a Valjoux 7750 base reworked by IWC: 28,800 vph, 31 jewels, about 44 hours of power reserve, no date function.
Fakes use an Asian 7750 copy. Through a display back you can see these differences:
- Rotor engraving. Genuine rotors carry deep, sharp engraving with the IWC mark and Probus Scafusia. Copies use shallow laser etching or pad printing.
- Balance wheel. Genuine uses a Glucydur-type balance. Copies use brass with gold-colored plating that wears at the rim.
- Finishing. Genuine perlage and Geneva stripes are fine and even. Copies show wide, uneven circles and burrs at the bridges.
- Chronograph reset. Genuine hands snap back to zero as a set. Copy hands lag, overshoot, or stop short.
The pushers tell you as much as the movement. Genuine pushers have short, crisp travel. Copies feel spongy and need a longer press.
Measure the case
Portugieser Chronograph cases measure about 41 mm across and about 12.5 mm thick, with 30 m water resistance. Many fakes run 1 mm to 1.5 mm thicker. Use calipers, not your eye. Thickness is the number that separates most replicas from the real watch, because a 7750 clone plus a stacked date plate adds height.
Read the dial and hands
- Printing. "International Watch Co." and "Schaffhausen" sit in two lines above the subdial at 12. Copy fonts thin out at the serifs and space letters too wide.
- Subdials. Running seconds at 6, chronograph minutes at 12. A date window at 3 means the watch is not a 3714.
- Applied numerals. Genuine indices have a sharp bevel and sit flush. Copies show rounded edges and glue residue at the base.
- Hands. Leaf-shaped with a flat polish. Copy hands show tool marks on the underside.
Inspect the case back and serial
Reference and serial numbers are engraved, not printed. Depth is consistent and the font matches IWC house style. Copy engraving sits shallow with a laser look. On display backs, check the inner ring for a reference stamp that matches the outer case back.
Strap, buckle, crown
Genuine alligator straps have a matte finish and stitched edges with small irregularity. Copy straps use embossed calf. Buckle engraving on a fake is thin and stamped rather than cut. The crown on a fake turns with grit and does not click into the winding position with a clean stop.
Price is a filter, not a proof
Genuine IW3714 examples trade in the mid four figures in USD on the secondary market. Listings at $400 to $900 are replicas. A seller who shows a genuine watch in photos and ships a copy is a common pattern on marketplaces without escrow.
Legal note for US buyers
Selling counterfeit watches is illegal in the United States under the Trademark Counterfeiting Act. US Customs can seize shipments. Buying a fake carries civil exposure, and resale carries criminal exposure.
Checklist before you pay
- Ask for a photo of the case back with the serial visible.
- Ask for a movement photo with the rotor turned to show the engraving.
- Ask for caliper photos of case thickness and lug width.
- Ask for the original invoice or service papers.
- Match the reference against an IWC catalog entry for dial and strap options.
- Pay with a method that allows a chargeback.