A counterfeit IW371447 is a fake of the IWC Portugieser Chronograph, a 40.9 mm steel watch with a Valjoux-based caliber 79350. Most fakes give themselves away in five places: case thickness, sub-dial spacing, dial printing, the reference engraving between the lugs, and movement finish. A loupe and a set of calipers answer the question in minutes.
What does the genuine IW371447 look like?
The IW371447 belongs to the Portugieser Chronograph line, ref. 3714, and shares its case and movement with the rest of that family. Steel case, 40.9 mm across, close to 12.3 mm thick, 30 m water resistance, alligator strap. The dial carries two sub-dials on a vertical line: a 30-minute chronograph counter at 12 and running seconds at 6.
Fake IW371447 Replica Watch: How to Spot One
- Caliber 79350, an IWC-modified Valjoux 7750: 31 jewels, 28,800 vph, about 44 hours of power reserve.
- No date window on the 3714 dial.
- Sapphire crystal at the front and a sapphire display back on standard versions.
- Applied numerals and markers with polished bevels, not printed.
Counterfeit or replica: what is the difference?
A counterfeit pretends to be a genuine IWC. A disclosed replica does not. That line matters, because the two sit in different places for buyers, for resale, and for the law.
Counterfeits travel with forged papers, a copied box, and a story about a gift or an estate sale. A replica is sold as a copy, at a copy price, with no claim of IWC origin. If someone asks genuine money for a watch with a copied serial, the watch is a counterfeit, whatever the listing says.
How do you spot a counterfeit IW371447?
Work through the checks in order. Three cheap tools cover the job: digital calipers, a 10x loupe, and a scale. The first three checks catch most fakes before you ever open the caseback.
1. Measure the case
Calipers on the case flanks should read 40.9 mm wide and close to 12.3 mm thick, crown excluded. Many fakes run 1 to 2 mm thicker because the Asian 7750 clone and its spacer need more room. Soft transitions between the lugs and the mid-case are another sign.
2. Check the sub-dial axis and spacing
Draw a mental vertical line through the crown, the 12 counter, and the 6 sub-dial. On a genuine dial those three points line up and both sub-dials sit the same distance from the center. Fakes shift one sub-dial a fraction of a millimeter, or fit a dial made for a different movement layout.
3. Read the printing under a loupe
At 10x, genuine text has clean edges and even stroke weight. The minute track is uniform, the IWC and Schaffhausen lettering sits level, and the numerals show polished bevels with sharp inner corners. Fake printing looks fuzzy, fills in at tight curves, and shows uneven gaps.
4. Look at the engraving between the lugs
The reference and serial sit on the case between the lugs at 6 and 12. Genuine engraving is shallow, crisp, and cut in a consistent font. Fakes laser-etch too deep, use the wrong digit spacing, or repeat a serial that shows up on forum lists.
5. Inspect the movement through the back
The caliber 79350 shows a signed rotor, Geneva stripes on the bridges, blued screws, and perlage on the mainplate. A clone 7750 can look close at a glance. Watch for a rotor engraving that sits off-center, rough anglage, and a balance wheel that wobbles when the watch is tilted.
6. Weigh the story around the watch
Papers, box, and price carry weight together. Forged cards are common and easy to print, so treat a full set as a small plus, not proof. A price far under the pre-owned market for a steel 3714 is the oldest warning sign in this hobby.
Which parts do fakers get wrong most often?
- Case thickness and the lug-to-mid-case transition.
- Sub-dial position and the depth of the recessed rings.
- Dial printing weight and the finish on applied numerals.
- Caseback engraving depth and font.
- Rotor engraving and bridge finishing on the movement.
- Crown logo sharpness and the feel of the chronograph pushers.
Pusher feel is a check people skip. Genuine 7750-based pushers start and stop with a firm click and reset with a short snap. Mushy or grinding pushers point to a cheap clone or a worn movement.
What red flags appear in counterfeit IW371447 listings?
- Photos that avoid the caseback, the crown side, and the lugs.
- A serial number that appears on more than one listing.
- No returns combined with a price far under market.
- Papers with a printed signature instead of a stamped and dated card.
- A seller who cannot say where or when the watch was serviced.
Ask for a timed video of the chronograph start, stop, and reset, plus a macro shot of the engraving between the lugs. Sellers holding a genuine watch send both without drama.
Is it legal to buy a counterfeit watch in the US?
Importing or selling counterfeits is illegal in the United States, and customs can seize the shipment. Buying one for personal use is a gray area that shifts by state, and it comes with no warranty, no service history, and no resale path. A fake IW371447 with a copied serial is money you will not get back.
Frequently asked questions
Does the IW371447 have a date window?
No. The classic 3714 dial has two sub-dials and no date. A watch sold as a 371447 with a date at 3 is either a different reference or a fake.
What movement is inside the real IW371447?
Caliber 79350, built on a Valjoux 7750 base and finished by IWC. It runs at 28,800 vibrations per hour, holds about 44 hours of power reserve, and places chronograph minutes at 12 and seconds at 6.
Can a watchmaker spot a fake from photos?
Sometimes. Case thickness and dial printing show up in good macro shots, but the movement and the engraving between the lugs need the watch in hand. A photo check is a filter, not a verdict.
How much should a genuine steel 3714 cost?
Pre-owned prices move with condition, box, and papers, so check current sold listings rather than one asking price. Anything far below the median for a comparable watch needs a reason you can verify.
Run the five checks before money changes hands. A caliper reading and a loupe view of the dial beat any paper document a seller hands you.