Short answer
A fake IW323747 is a replica of an IWC wristwatch that carries reference number IW323747. IWC's public catalog does not list this reference today. Secondary sources disagree about case size and production years. That gap matters. A buyer has no single official spec sheet to compare against, so identification rests on case measurements, dial printing, movement architecture, and caseback engraving.
What the reference number means
IWC reference numbers start with IW and continue with digits. The first four digits mark the model block. The last digits mark one case, dial, and bracelet combination. IW323747 points to one configured version inside the IW3237 family, not to a group of watches. Listings that show one photo for several IW3237 variants are a warning sign.
Public databases place IW3237 in the IWC Ingenieur line. Case sizes in those databases run from 40 mm to 42 mm. Treat those numbers as unconfirmed. IWC service centers can check a reference against factory records.
Case and dimensions
- Measure the case with calipers. Diameter, thickness, and lug width come first.
- Check lug angles. Replica cases lose 1 mm to 2 mm at the lug tips.
- Weigh the watch head. Grade 316L and 904L steels differ in density.
- Inspect the case flank near the crown. Cast cases show soft edges and rounded bevels.
Dial, hands, and printing
- Count the hash marks. Merged or missing markers appear on low-tier copies.
- Check applied indices. Genuine indices are polished on the bevels.
- Look at the date window edge. Sharp cutouts cost more to machine.
- Compare hand lengths to the minute track. Replica seconds hands run short.
- Check text weight. Thin, gray printing points to pad printing on a cheap dial.
Movement
Replica IWC watches use three movement groups: Chinese copies of the ETA 2824, Chinese copies of the Sellita SW200, and decorated Miyota 9015 units. A genuine IWC automatic in the IW3237 block uses an in-house caliber with a signed rotor and a set jewel count. Ask for a movement photo with the caseback removed. High-beat 28,800 vph balances appear in all three groups, so beat rate alone proves nothing.
Caseback, crown, and bracelet
- Engraving depth: laser etching looks gray and shallow; stamping cuts deeper.
- Reference and serial fonts: compare each digit against a known photo.
- Crown threads: a stiff, grinding thread points to a cheap tube.
- Bracelet end links: gaps at the lug line are common on replicas.
- Clasp logo: check letter spacing and the finish of the clasp edges.
Price tiers
Replica IW323747 listings fall into three bands. Low tier: $80 to $150, mineral glass, plated case. Mid tier: $250 to $450, sapphire glass, 316L steel, ETA clone. High tier: $500 to $900, sapphire with anti-reflective coating, Swiss movement option, closer case geometry. Prices shift with exchange rates and shipping.
Verification steps
- Ask for 10 photos: dial straight, dial angled, case flank, crown, caseback, clasp, bracelet, movement, lume, wrist shot.
- Request caliper readings for diameter and thickness.
- Request a 30-second video with the seconds hand running.
- Compare each photo against a known genuine photo of the same reference.
- Take the watch to a watchmaker with a timing machine. Ask for rate, amplitude, and beat error.
What this guide cannot confirm
No public source gives a full factory spec sheet for IW323747. Case size, caliber, and production years stay unconfirmed. Treat any seller claim of "1:1" as marketing text. Buy on measurements and inspection, not on labels.