A fake IW371476 is a replica of the IWC Portugieser Chronograph, a stainless steel chronograph with a 40.9 mm case and two subdials at 12 and 6 o'clock. Four checks expose most of them: case size, dial print, subdial spacing, and the movement behind the sapphire caseback. Fakes pass two or three of those checks and fail the rest.
What Is the IW371476?
The IW371476 belongs to the IWC Portugieser Chronograph family, a line known for a clean dial with a 30-minute counter at 12 and running seconds at 6. The steel case measures about 40.9 mm across and 12.3 mm thick, with 20 mm lugs and sapphire crystals on both sides.
Water resistance is rated at 3 bar, which covers splashes and rain and nothing more. A flat, simple dial is easy to fake at a glance and hard to fake under a loupe. That gap is where the replica trade lives.
Fast Checks Before You Study Details
- Measure the case across the bezel. It should read 40.9 mm.
- Measure the thickness. 12.3 mm, not 14.
- Measure the lug gap. A 20 mm strap fits, a 22 mm strap does not.
- Count the subdials. Two, stacked on the vertical center line.
- Flip it over. Sapphire caseback with engraved reference text.
Case and Dimensions: The First Real Test
Diameter and thickness
Replica cases run large. A fake that measures 42 mm looks wrong next to any photo of the real watch, and the extra height pushes the watch off the wrist. Calipers settle the question in ten seconds.
Finishing and edges
Real IWC cases mix brushed and polished surfaces, and the border between them is crisp. Replica cases blur that border or polish the whole body. Run a fingernail along the lug edge. A sharp change means the case was finished with care; a soft, rounded edge means it was not.
Crown, pushers, and crystal
The crown sits flush with the case band, and the two chronograph pushers travel with firm resistance and a clean click. Loose pushers on a fake pair with a chronograph hand that jumps on start. The sapphire crystal shows a faint blue tint at the edge under strong light.
Dial and Hands: Where Most Fakes Fail
- Print: the brand name and city line sit level and thin, with even spacing. Fakes use heavy type and crowd the letters.
- Indexes: applied, polished, and set flat. Loose or tilted markers are a red flag.
- Subdial rings: thin printed rings with clean numerals. Fakes print thick rings and pinch the numbers.
- Hands: leaf shape, matched finish, and a minute hand that reaches the minute track.
- Lume: applied to the indexes with sharp edges. Overflow onto the dial is common on cheap builds.
The Movement and the Caseback
References in the 3714 family use a chronograph calibre built on the Valjoux 7750 architecture, listed as calibre 79350 in most of them. Power reserve runs about 44 hours at 28,800 vibrations per hour, which is 4 Hz. Rotor engraving on the real watch is deep and even.
A 7750-based movement has one signature: the rotor swings with a light shudder when you move your wrist. Fakes run Asian chronograph movements with a different beat rate, a thin rotor, and pushers that feel like a ballpoint pen.
What Does a Genuine IW371476 Cost, and What Do Fakes Sell For?
Used Portugieser Chronograph watches trade in the low thousands of dollars, with dial color, box, and papers moving the number. Check live listings for the version you want, because prices shift with the market. Replica versions sell from under $100 for quartz builds to several hundred dollars for mechanical ones.
A replica will not hold value, and no watchmaker will service it with factory parts. Weigh that against the price before you buy.
Questions Buyers Ask
Is a fake IW371476 worth buying?
It depends on your goal. If you want the look of a Portugieser Chronograph for a fraction of the cost, a well-made replica delivers that. If you want resale value or an easy service path, it does not.
Can a watchmaker tell a fake from a real one?
Yes. Case measurements, caseback engraving, and movement finish give it away on a bench within minutes. A trained eye does not need to open the case.
Do replicas of this reference keep time well?
Some do, within about 10 to 20 seconds a day. Quality varies by movement, so ask for a timing photo before you pay.
Is a replica water resistant?
Treat it as splash resistant at best. The genuine watch is rated at 3 bar, which is already minimal, and fakes rarely seal to even that level.
What to Ask a Replica Seller
- Case diameter and thickness, measured, not claimed.
- Movement type and beat rate.
- Photos of the exact watch you will receive.
- Strap, buckle, and clasp details.
- Return window and refund terms.
Ask those five questions and you will sort serious sellers from drop shippers. The photos matter most. A seller who sends a catalog image has no watch in hand.