Short answer
IW323750 is not a reference number IWC publishes in the catalog material I can verify. The 323x block belongs to the Ingenieur Automatic line, which IWC lists under numbers such as IW323902 and IW323906. Two things follow. A listing that says replica iw323750 usually sells a replica of an Ingenieur Automatic with a number the seller cannot document. Buyers should confirm the exact reference before comparing specs. If the seller cannot show the original reference, treat the listing as an Ingenieur Automatic replica and check it against the 40 mm Ingenieur pattern.
What the IWC Ingenieur line is
IWC launched the Ingenieur in 1955. The point of the model was magnetic protection. A soft-iron inner case shielded the movement from magnetic fields that pull a watch off time. Gerald Genta designed the 1976 Ingenieur SL, reference 1832, with an integrated bracelet and a bezel cut into five sections. Later generations kept the name and changed the case. The 2005 reference 3227 used five screws on the bezel. The 2013 reference 3239 returned to a 40 mm case with a plain bezel.
Specs a 1:1 replica copies
On the 3239 pattern, these are the numbers buyers check:
- Case diameter: 40 mm, thickness near 10 mm
- Case material: stainless steel, polished and brushed
- Movement: IWC calibre 30110, based on the ETA 2892-A2, 42 hours of power reserve
- Crystal: sapphire with anti-reflective coating on both faces
- Water resistance: 120 m on the original
- Dial: date window at 3 o'clock, applied hour markers
- Bracelet: integrated steel link bracelet with a folding clasp
Movement tiers in replicas
Three tiers exist. The cheapest replicas use a 21,600 vph Chinese automatic such as the DG2813 with a decorated rotor. The mid tier uses a Miyota 9015 or a Seagull ST18, both at 28,800 vph. The top tier uses a Swiss ETA 2892-A2 or a close copy. That is the same base calibre as the genuine 30110, so the sweep rate and the date change point line up with the original. The cheaper movements do not.
Price bands
Asking prices for this pattern run from about $80 to $600. Under $150 buys a case and a low-grade movement. The $200 to $350 range buys a 28,800 vph movement, sapphire, and closer case finish. Above $400, sellers claim Swiss movement and tighter tolerances. Price alone proves nothing. Movement type and case finish do.
Checks before buying
- Ask for a case back photo with the reference number visible. If the seller only repeats iw323750, ask again.
- Ask for a movement photo with the case back removed.
- Ask for a timegrapher reading. A healthy 2892-based movement shows plus or minus 10 seconds per day at 28,800 vph.
- Compare the date font and the window position against photos of the original.
- Check the bracelet end links. A gap at the lug line is the most common flaw.
What a replica does not match
The soft-iron inner case is the main gap. Genuine Ingenieur watches use it for magnetic protection. Most replicas omit it or fit a thin steel ring. Water resistance is unverified on replicas. Sellers rate them at 50 m or more, but gaskets are not pressure tested, so do not swim in one. Case flank finishing and the clasp also differ under a loupe.