The 30-second answer
A replica IW329071 is a counterfeit copy of an IWC watch from the IW3290 reference block. Public IWC catalogs list that block under the Aquatimer Automatic 42 line. The genuine watch has a 42 mm steel case, a sapphire crystal, and a 300 m depth rating. Reproductions run 42 mm across but almost never hold a 300 m seal. Price bands: $90 to $180 for a low-grade build, $200 to $400 for a mid-grade build with an Asia 2824 clone, $450 to $700 for a Swiss ETA or Sellita inside. The movement moves the price more than any other part. Reference blocks are reliable. Variant numbers change with dial and strap, so confirm the exact watch with the seller.
How to read the reference number
IWC writes references as IW plus a four-digit family plus a two-digit variant. In IW329071 the family is 3290 and the variant is 71. The family sets case shape, bezel type, and movement class. The variant sets dial color, hands, and strap. Two variants in one family can differ by dial and strap alone. A seller who shows a photo of a different variant is not selling the reference you asked for. Ask for a caseback photo with the engraved number before payment.
Genuine specs a copy chases
- Case: 42 mm stainless steel
- Crystal: sapphire with antireflective coating
- Water resistance: 300 m on the genuine watch
- Movement: IWC automatic calibre on a Sellita base
- Strap: rubber, or a steel bracelet on some variants
Numbers shift by variant. Pull the maker spec sheet for the exact reference before you compare anything.
Movement tiers
- Asia 2813: 21,600 vph, low cost, loud rotor
- Asia 2824 clone: 28,800 vph, about 38 hours of reserve, the common mid tier
- Swiss ETA 2824-2 or Sellita SW200: 28,800 vph, tighter tolerances, top tier
Ask for a timegrapher screenshot. Rate inside 10 seconds per day and amplitude above 250 degrees are the two numbers to read. A seller who cannot produce one is selling blind.
Case and dial checks
- Bezel: clean clicks, no back play, aligned at 12
- Dial print: sharp edges, no double strike on the logo
- Date window: centered, no paint bleed
- Lume: even fill, one color across hands and markers
- Crown: threads catch on the first turn, no wobble
- Strap or bracelet: end links sit flush, no gap at the lugs
What a fake does not give you
No IWC warranty. No service from an IWC boutique. No resale value. No verified depth rating. Customs agencies treat counterfeit watches as seized goods. U.S. Customs and Border Protection can hold or destroy a shipment, and the buyer carries the loss. Swiss law bans the sale of counterfeits inside Switzerland.
Buying checklist
- Confirm the variant number and the dial color.
- Ask for movement photos and a timegrapher reading.
- Ask for a pressure test result if you wear it near water.
- Buy one watch, inspect it, then decide on a second.
- Keep the payment record and the chat log.
Cost summary
A mid-tier replica IW329071 lands near $300. Servicing a Swiss movement inside costs $80 to $150 at an independent watchmaker. Genuine Aquatimer Automatic 42 watches trade in the thousands of dollars, so the gap is wide and that gap is the whole product.