Short answer
Replica IW323757 watches are aftermarket copies of an IWC Ingenieur Automatic reference in the 3237 family. No replica uses the IWC in-house calibre. Most run a Miyota 9015, a Seiko NH35, or a Chinese-made ETA 2824 clone with an engraved rotor. Case diameter on replicas is listed between 40 mm and 44 mm, depending on the seller. Prices run from about $80 for a basic build to $400 or more for a high-grade copy.
What the reference number means
IWC reference numbers use the IW prefix plus six digits. The 3237 block covers Ingenieur Automatic models. Trailing digits mark case material and dial variants. The 323757 code appears in replica listings. Public reference databases carry thin documentation of that exact suffix, so ask the seller for photos of the caseback and the movement before you pay.
The genuine Ingenieur Automatic from that period carries an IWC 80000-family movement, a soft-iron inner case for magnetic protection, and a screw-down crown. Those three parts drive most of the cost gap between a real watch and a copy.
Movement options in replicas
- Miyota 9015: 28,800 vph, 24 jewels, hacking, about 42 hours of reserve.
- Seiko NH35: 21,600 vph, 24 jewels, about 41 hours of reserve. The lower beat rate shows in the sweep.
- 2824 clone: 28,800 vph. Ships with a fake IWC rotor and engraved bridges in many listings.
A genuine 80110 beats at 28,800 vph. If a movement photo shows a rotor engraved with the IWC name but a base plate marked Miyota or Seagull, you know what sits inside.
Checks before purchase
- Case diameter and thickness in millimeters, measured with calipers, not copied from a listing.
- Crystal material. Sapphire with inner anti-reflective coating is the usual claim. Mineral glass shows up at low prices.
- Dial printing. Inspect the brand lettering and the INGENIEUR text at magnification.
- Date wheel alignment. An off-center date window is the most reported fault on this model.
- Bracelet end links. Gaps at the lugs are visible in photos.
- Water resistance. Most replicas carry no rating. Do not swim with one.
- Weight. Steel Ingenieur cases run heavy. Copies often arrive light.
Price bands
Under $120: mineral glass, NH35, stamped clasp, hollow end links.
$150 to $280: sapphire crystal, 2824 clone or 9015, solid links, cleaner dial print.
Above $300: closer case finishing, AR coating, and in some listings a clone movement with the correct beat rate. It is still not a genuine watch.
Legal note
Counterfeit watches are illegal to import and sell in the United States. U.S. Customs and Border Protection can seize shipments. A replica carries no manufacturer warranty, no service history, and no resale market outside replica buyers.