No authorized IWC dealer and no honest private seller has a reason to sell a genuine Portugieser Chronograph reference IW371625 at a steep discount, so the practical rule is simple: treat any bargain on this reference as counterfeit until the watch, its movement, and its paperwork prove otherwise. Have the watch inspected by a qualified watchmaker or an authorized service center before money changes hands, and walk away from any seller who resists that step. Authentication is cheap compared with the cost of a convincing fake.
What to inspect on the watch itself
Dial and printing
Genuine IWC dial printing is crisp under magnification, with even letter spacing and clean edges on every marker. Counterfeits usually fail on the small text: the reference or brand lettering looks slightly heavy, the subdial rings lose sharpness, and applied indices sit unevenly against the dial surface. Check the subdial layout as well. A Portugieser chronograph has a specific arrangement of chronograph and running seconds registers, and fakes often copy a photograph rather than the real layout.
Case, crown, and pushers
Look at the finish transitions. Genuine cases show a clean line between polished and brushed surfaces, sharp lug edges, and a crown that screws down with a firm, even feel. On fakes, the bevel between polished and brushed zones is often soft and rounded, the pushers feel gritty or sit at slightly different heights, and the caseback engraving looks shallow or laser-etched rather than deep and defined.
Movement and caseback
Open the caseback, or ask for clear photographs of the movement. Portugieser Chronograph references in this family typically use an in-house column-wheel chronograph calibre running at 28,800 vibrations per hour, and the finishing should be consistent with Swiss production: striped bridges, jeweled bearings set cleanly, and no rough machining marks. Counterfeit movements often show a decorated rotor over a basic modular movement, mismatched screw heads, or a rotor that spins with almost no resistance.
Specification bands worth verifying
- Case diameter: around 41 mm for Portugieser Chronograph references, with thickness near 13 mm.
- Crystal: sapphire front and back, with no visible distortion at the edges.
- Water resistance: modest, in the region of 3 bar, so a seller claiming dive-watch depth is a warning sign.
- Chronograph: column-wheel actuation with a crisp start, stop, and reset sequence.
- Power reserve: roughly two days on a full wind for this calibre family.
Always confirm the exact figures against official IWC documentation for the specific reference, since production years differ.
Paperwork, provenance, and seller behavior
Documents matter, but they are not proof on their own. Match the serial number on the caseback to the warranty card and any service records, and check that the card is not a photocopy or a reprinted blank. Ask where the watch was bought, when it was last serviced, and whether the seller will meet at a watchmaker. Refusal, vague answers, stock photos instead of real images, pressure to pay through irreversible methods, and listings that advertise replica grade language are all reasons to stop.
Common pitfalls
- Judging authenticity from the box and manual, both of which are widely copied.
- Accepting a phone screenshot of a receipt as provenance.
- Buying from a listing that shows brand photography instead of the actual watch.
- Skipping a movement inspection because the seller offers a short return window.
- Assuming a high price rules out a fake. Some counterfeits are sold near genuine market value.
FAQ
Is IW371625 commonly counterfeited?
Popular steel chronograph references attract copies, so assume the market contains them and verify accordingly.
Can a jeweler authenticate it?
A watchmaker familiar with IWC can spot most problems, and an authorized service center can confirm the movement and serial number.
Do box and papers prove it is real?
No. Packaging is easy to copy. The movement, case finishing, and serial verification carry the real weight.
What is the safest way to buy?
Buy from an authorized dealer or a documented seller who allows a pre-purchase inspection by a qualified watchmaker, with payment released only after verification.