A replica iw371653 is a counterfeit copy of the IWC Portuguese Chronograph reference IW371653. IWC Schaffhausen does not make it, license it, or service it, and US law treats selling or importing it as trademark counterfeiting. The genuine reference is a 40.9 mm stainless steel automatic chronograph with a Valjoux-based movement, and most watches advertised under this number do not match those specifications.

What the genuine IW371653 is

The reference belongs to the IWC Portuguese Chronograph family, known by the model code 3716. IWC identifies each variation inside that family with a different final pair of digits, so IW371653 points to one specific combination of case metal, dial, hands and strap rather than to a separate watch design.

The 3716 platform itself stays consistent across the line:

• Stainless steel case, 40.9 mm across, around 12 mm thick
• Water resistance rated to 3 bar, which covers splashes rather than swimming
• Caliber 79350, a chronograph movement derived from the Valjoux 7750, running at 28,800 vibrations per hour with roughly a 44 hour power reserve
• Two registers: running seconds at 6 o'clock and a 30 minute chronograph counter at 12 o'clock
• Feuille hands, applied Arabic numerals, and sapphire crystal on the front and back

Those details are the quickest way to separate a real Portuguese Chronograph from a copy carrying the same reference number.

How replica versions of this reference usually differ

• Case thickness. Copies often run a millimeter or two deeper so a generic movement will fit inside.
• Register function. Many fakes wire one subdial to a 24 hour or calendar indicator instead of a true chronograph minute counter.
• Movement. Quartz or low grade automatic calibers replace the 7750 based unit the case was designed around.
• Dial printing. Typography that is too heavy, numerals with soft edges, or uneven lacquer under the crystal.
• Case back. Engraving that is shallow or misaligned, or a reference number that does not match the dial.
• Finish. Sharp case edges, pushers that rattle, and bracelets with stamped rather than machined clasps.

Why the reference number is a weak buying signal

Sellers apply popular reference numbers to whatever stock they have on hand. Two listings for a replica iw371653 can describe watches with different case sizes, different movements, and different dials, because the number is marketing text instead of a specification. Nothing about such a listing is verified by IWC, and the seller has no obligation to describe the watch accurately.

Legal position in the United States

Trafficking in counterfeit goods is a federal offense under 18 U.S.C. § 2320, and US Customs and Border Protection can seize counterfeit shipments at the border. Buying one watch for personal use carries less exposure than selling, but importing in quantity, reselling, or presenting a copy as genuine can lead to seizure, civil penalties, and in serious cases criminal charges. A copy also has no manufacturer warranty and no service path through IWC or an authorized repair center.

What to check before you trust a watch sold as IW371653

• Ask for a clear photo of the case back and compare the engraved reference with the listing.
• Confirm the chronograph works as a chronograph: start, stop, reset, and a minute counter that actually advances.
• Check the crown and pushers for a solid, machined feel.
• Have a watchmaker open the case. The movement is the hardest part of a watch to fake convincingly.
• Compare dial typography and hand shape against IWC's own images of the reference.

Common questions

Is a replica IW371653 the same as the original?

No. It is an unlicensed copy that imitates the appearance of the reference. It is not produced by IWC, it does not carry IWC parts, and it cannot be authenticated or serviced by the brand.

Why are there so many IW371653 replicas?

The Portuguese Chronograph is a widely recognized design with a clean dial layout, which makes it a frequent target for copyists. The reference number itself is easy to print on a case back, so it spreads quickly through online listings.

Can IWC service a replica IW371653?

No. IWC services its own watches and verifies authenticity during intake. An independent watchmaker may work on a copy, but parts availability and resale value will be limited.