The top pick for most buyers is a fake IW329146 built as a steel dive watch with a Swiss ETA 2824-2 or Sellita SW200-1 automatic inside, because that combination gets the winding feel, the sweeping seconds hand, and the service options closest to the real thing without paying for a movement nobody will ever see. Five criteria decide whether any copy of this reference is worth owning: the movement, the case and bezel function, the dial and lume, the crystal and caseback, and how much the seller tells you before you pay.
Confirm the reference before you compare prices
IWC files its dive watches under the Aquatimer name, and reference numbers in the 3291xx block sit in that diver family. IW329146 is one of them, so check it against the current catalog and note four things: case diameter and material, how the bezel is operated, the dial color and index layout, and the strap or bracelet it shipped on. Replica listings are often a mashup, with a case from one reference and a dial or bracelet from another. If the listing photo does not line up with the catalog image, the watch in the box will not line up either.
Movement: the part you feel every day
Three options turn up in fake IW329146 listings: a Swiss ETA 2824-2 or Sellita SW200-1, an Asian copy of the same design sold as a 2824 clone, and quartz.
Pros
- Swiss automatic: smooth crown winding, a seconds hand that sweeps, and parts any competent watchmaker can service.
- Asian 2824 clone: lower cost, and a well regulated example can keep time within a few seconds a day.
Cons
- Swiss automatic: costs more, and the label gets used loosely, so ask for a movement photo and a timegrapher readout.
- Asian clone: quality shifts between batches, and rough winding or rotor noise is common on cheap examples.
- Quartz: a ticking seconds hand is an instant tell on a diver that should sweep.
Buy it if: you plan to wear it often and would rather service it than replace it. Skip quartz on this reference entirely.
Case, crown, and bezel function
This is where the price gap shows up. A good case has crisp lug edges and even brushing. A good bezel indexes with a firm click instead of a soft grind, and crown threads engage without wobble.
Pros
- Correct case thickness and lug width, so the watch sits like the original on the wrist.
- Screw down crown with clean threads and a bezel that lands on the marker at twelve.
Cons
- Cases that are too thick or too thin, which changes the entire profile.
- Gritty bezel action, cross threading crowns, and inserts that sit proud of the bezel edge.
Buy it if: you actually use the bezel and screw the crown down. If you never touch either, this is the first place to save money.
Dial, hands, and lume
Pros
- Sharp printed indices, a date window that sits square in its aperture, and hands with clean edges.
- Lume that charges under a lamp and still glows after a few hours.
Cons
- Fat or blurry fonts, an off center date, and hands that look stamped rather than finished.
- Weak lume that fades within minutes, which is the most obvious flaw in low light.
Buy it if: you wear the watch in the evening or take close up photos of it. A bad dial is visible from conversational distance.
Crystal, caseback, and engraving
Pros
- Sapphire with inner anti reflective coating, so the dial stays readable at an angle.
- Caseback text in the right place, with the correct reference and a deep engraving.
Cons
- Mineral glass that scratches within months and reflects like a mirror.
- Shallow laser engraving and the wrong reference number, a detail that gets noticed when the watch changes hands.
Buy it if: sapphire and correct caseback markings are on your short list. Both are hard to fix later.
Strap, bracelet, and water resistance
Pros
- A rubber strap with the right texture and flex, or a bracelet with solid end links and a firm clasp.
- Gaskets present at the caseback, crown, and crystal, which is the minimum for splash resistance.
Cons
- Stiff rubber that pulls hair and hollow end links that rattle.
- Water resistance claims that nobody has tested. Treat every replica as splash resistant until a watchmaker pressure tests it.
Buy it if: the strap matches the reference and the seller is honest that the watch is not rated for swimming. Never dive with a replica, no matter what the listing says.
Seller practices that separate a good copy from a bad one
Before you order, ask for these and watch how the seller responds. Photos of the actual unit, not stock images. A movement photo. A timegrapher reading with rate and amplitude. A clear statement of case material and crystal type. An answer on water resistance that does not promise diving. Red flags include 1:1 Swiss made language, no unit photos, no movement shots, and a refusal to discuss returns.
Inspection checklist when the watch arrives
- Check the reference on the caseback against the listing and the catalog.
- Wind the crown and feel for grit, then set the date and confirm it flips cleanly at midnight.
- Rotate the bezel and confirm it indexes at twelve and does not wobble.
- Hold the dial under a lamp for a minute, then check the lume in a dark room.
- Look at the dial from a low angle to judge crystal reflection and index alignment.
- Time it over three days against a phone clock and note the daily gain or loss.
Who should skip the replica
If you need a warranty card, factory service, or a watch you can genuinely dive with, buy the genuine article. A fake IW329146 is for wearing, handling, and enjoying the design. It is not a substitute for a pressure tested tool watch.
Bottom line
Choose the Swiss automatic build, confirm the reference details before you compare any two listings, insist on unit photos and a timegrapher readout, and budget for a service or a strap swap within the first year. Do those four things and the fake IW329146 you buy will look and feel like a watch worth owning rather than a costume piece.