Replica IW371649: The Short Answer
The reference IW371649 sits inside IWC's 3716 block, the current generation of the Portugieser Chronograph: roughly 41 mm of stainless steel, two subdials, applied numerals, leaf hands, and IWC's in-house caliber 69355. Fakes exist because that design is clean and popular. They range from rough to genuinely close. Close is not the same as correct, and no copy carries IWC's movement, its finishing, or any warranty.
One honest note before anything else: IWC assigns different numbers inside the 3716 block for dial and strap combinations. If a listing quotes a specific colorway for IW371649, check it against IWC's own product page. Sellers mix numbers up constantly, and frequently they are describing a photo, not a watch.
Why This Reference Gets Copied
A flat dial, two counters, and a smooth bezel are forgiving shapes. There is no complex case geometry to fake and no exotic material to source. That makes the Portugieser Chronograph a favorite for factories that want a recognizable silhouette with a low failure rate.
The older 3714 generation adds another wrinkle. It ran a modified Valjoux 7750 (caliber 79350), and that base movement is still cheap and everywhere. Plenty of replicas are built around an Asian 7750 or a Seagull chronograph base and dressed up to look like the newer in-house caliber.
Where Copies Give Themselves Away
- Case height and slope. A 7750-based build usually sits thicker than the real thing, and the lugs lose their curve.
- Dial printing. Look at the thickness and spacing of the "IWC" and "SCHAFFHAUSEN" text, and at whether the numerals are cut or simply printed flat.
- Subdial spacing and hand finish. Counters drift inward on cheap copies. Real leaf hands taper to a point; fakes often have blunt, painted tips.
- Crystal and coating. Genuine sapphire has a faint blue or colorless sheen. Heavy purple flare is a giveaway.
- Caseback and rotor. Engraving depth, font weight, and movement decoration are where the money usually got saved.
The Movement Is The Real Tell
Wind it and listen. A genuine 69355 winds smooth and the rotor moves quietly. A modified 7750 clicks, wobbles, and often runs loud. Push the chronograph and watch the seconds hand snap back: sloppy reset is normal on copies. Hand wound Seagull bases usually have no rotor at all, which is why some listings quietly describe the watch as an automatic when it is not.
What The Low Price Buys
Nothing that can be serviced by IWC, and nothing that holds value. Water resistance is a claim on paper. Parts are matched by luck. A $300 copy that needs a $200 repair is a $500 copy with no resale.
Legal Reality In The U.S.
Trafficking in counterfeit goods is a federal crime under 18 U.S.C. 2320, and Customs can seize and destroy an import at the border. That risk sits with the buyer as well as the seller. If you want the Portugieser look with a clear conscience and a serviceable movement, the secondary market for genuine ref. 3716 and 3714 watches is deep, and the price gap narrows more than most people expect.