Quick answer
IW323733 is an IWC reference in the Ingenieur Automatic family. IWC numbers every watch with the letters IW plus six digits. The last two digits mark a dial, strap, or market variant, so IW323733 sits inside the IW3237 block. The original is a steel sports watch: round case near 40 mm, screw-down crown, integrated bracelet, and a soft-iron inner case for magnetic shielding. A replica copy sells for $80 to $400. Price tracks three parts: the movement, the case finishing, and the bracelet construction.
Before you pay, check the exact dial color and case diameter against IWC's own reference table. Sellers reuse one reference number across several variants.
Movement
- DG2813 family: 21,600 vph (3 Hz), 21 jewels, about 36 hours of reserve. The seconds hand moves in visible steps at close range.
- ETA 2824 clone or Seagull ST2130: 28,800 vph (4 Hz), 25 jewels, 38 hours of reserve, hacking, quick-set date.
- Asia 2892 or Miyota 9015: 28,800 vph, 42 hours, thinner rotor stack, so the case sits nearer 10 mm thick.
Ask for the movement code in writing. A seller who will not name it is selling the cheapest option in the listing.
Case and bracelet
Most copies use 316L stainless steel. A few use 904L, which costs more and polishes to a brighter tone. Look at the transition between brushed top surfaces and polished bevels on the lugs. Sharp edges with no burrs are the sign of a machined case, not a stamped one. The integrated bracelet uses screw links. Weight for a steel case on a full bracelet runs 150 g to 170 g. Anything under 130 g is hollow or plated.
Dial, hands, date
Originals use applied indices with polished edges. Check that the indices sit level and that the lume is even. The date should flip within 10 minutes of midnight. A date that drifts past 12:30 means a worn date wheel or poor assembly.
Water resistance
ISO 22810 sets the test criteria for watches sold as water resistant. Replica gaskets are not tested to that standard. Treat any copy as splash resistant only. Do not swim with it, and do not press the crown underwater.
Checks on arrival
- Wind the crown 30 turns and check the power reserve overnight.
- Time it against a phone clock for 24 hours. Over 20 seconds a day needs regulation.
- Check every bracelet screw and add Loctite 243 to any that move.
- Test the crown threads. Cross-threading is common on copies.
- Inspect the caseback engraving under a loupe.
Limits
IWC will not service a copy, and no original parts fit. An independent watchmaker can clean and regulate the movement for $70 to $150. Resale value is low, so buy a copy to wear, not to hold.