Quick answer
A fake IW371471 is a counterfeit copy of an IWC Portugieser Chronograph. Photos alone do not settle the question. The check runs in this order: movement, caseback engraving, dial printing, case finish, then paperwork and price. IWC sells no watch described as a 1:1 replica. Any watch sold under that label is a counterfeit, not an alternate version.
What the reference is
IW371471 sits in the IWC Portugieser Chronograph family, reference series 3714 and 3716. Family specs: 41 mm case, sapphire crystal, subdials at 12 and 6 o'clock, date at 3 o'clock.
Movement depends on build year. Watches from 2020 on use IWC calibre 69355, an automatic chronograph with a 46-hour power reserve. Earlier watches use calibre 79350, which follows the Valjoux 7750 layout. Both run at 28,800 vibrations per hour.
Dial color, case metal, and strap vary by year. Confirm those from the IWC record for the exact reference before comparing a listing photo.
Movement tells
Counterfeit Portugieser Chronographs use one of three movements: a Chinese 7750 copy, a Seagull ST19 hand-wound, or quartz. Three checks:
- The sweep hand moves once per second. That is quartz. A mechanical chronograph sweeps 8 beats per second at 28,800 vph.
- Shake the watch. A real 69355 or 79350 rotor spins and its weight is felt. A quartz watch has no rotor.
- Start the chronograph. Pushers on a real watch have firm, short travel and a clean click.
IWC puts the calibre number and the IWC medallion on the rotor. Counterfeit rotors are plain or carry engraving with soft edges.
Caseback and engraving
Laser etching looks flat and gray. Real engraving cuts into steel at uniform depth. On a real watch the reference number and the serial number sit on the caseback. Some Portugieser Chronographs carry a sapphire display back. Confirm the caseback type from the reference record.
Dial and hands
- Text: "IWC" and "SCHAFFHAUSEN" are two lines with tight, even spacing. Fake printing smears at the serifs and sits off center under 12 o'clock.
- Subdials: concentric rings at 12 and 6 o'clock. Fakes use flat discs with printed rings.
- Hands: leaf shape with polished bevels. Hour and minute hands align to the minute track when set.
- Date: black font on white, centered in the window at 3 o'clock.
Price floor
Used steel Portugieser Chronographs list between $5,500 and $8,500 in the US market. Year, dial color, and condition move the number. A "new" IW371471 at $300, or any listing under $1,500, is a fake or a bait listing. No legitimate seller takes that loss on a working automatic chronograph.
Paperwork check
A real watch ships with a box, a booklet, and a warranty card that matches the serial on the caseback. IWC registers watches in My IWC and extends the warranty period when the owner signs up. A counterfeit seller cannot register the serial. Ask for the card number, then call an IWC boutique or IWC customer service.
Six photos to request
- Dial, straight on, no flash.
- Caseback, full frame.
- Crown and pushers, side profile.
- Movement through the case back, if a display back is fitted.
- Buckle and strap ends.
- Warranty card and box, serial visible.
Ask the seller to place a card with the current date next to the watch. A seller who has the watch in hand can do this. A seller who drop ships cannot.