IW329124 belongs to IWC's 3291 reference family, the Aquatimer Automatic 42. If you are shopping for a replica of it, the short version is this: good copies exist, but this reference is harder to fake well than a Submariner or a Speedmaster because of one feature. The outer bezel drives an inner bezel under the glass. Get that linkage wrong and the watch feels cheap the moment you touch it.
So the checklist stays narrow. Case profile, bezel linkage, dial printing, movement. Everything else is secondary.
The real watch, in plain terms
The Aquatimer Automatic 42 is a 42mm steel dive watch rated to 300m. It has a screw-down crown, a solid caseback, and a rotating bezel you can work with gloves on. Production year matters for your shopping: earlier 3291 examples ran IWC's 30120 movement, newer ones run the 32111 with a much longer power reserve. Ask the seller which generation they copied, because the caseback engraving and the dial text differ between them.
What separates a good copy from junk
- Bezel linkage. Turn the outer ring a quarter turn at a time. The inner ring under the crystal must move with it, in step, with no lag and no grinding. This one test tells you more than any photo.
- Case thickness. The original sits around 14mm. Copies that come in at 15mm or more wear like a brick and often mean a thick spacer over a small movement.
- Crown threads. A screw-down crown should take three or four smooth turns to seat. If it bites at the start, the tube is cut with a burr and water will find it.
- Dial detail. Applied indices, flat lume plots, a date window at 3 with the right font weight. Misaligned markers at 12 are the single most common flaw.
- Lume. Should be clean white or cream, glowing green or blue. Yellow or grey lume is a tell.
Movement and water resistance
Most of these run a Miyota 9015 pattern or a 2824 pattern. The Miyota is the better pick: 28,800 vibrations per hour, a smooth sweep, and parts that are easy to source. A 21,600 bph movement with a stuttery seconds hand is a downgrade, no matter what the listing claims.
On water resistance, assume nothing. A replica sold as "300m" is not pressure tested and the gaskets are unknown. Treat it as splash-proof. If you plan to swim, have a watchmaker pressure test it first, and accept that the seals may not survive the test.
What these sell for
Prices cluster in three bands. Under about $120 you get stamped cases and printed dials. Between $250 and $450 the case is milled and the bezel works. Above $500 you are paying for a better movement, sapphire with decent AR coating, and a strap that does not smell like a tire. None of those numbers guarantee quality, so use the checklist above as the tiebreaker.
Ask before you pay
- Which movement, and what beat rate?
- A short video of the bezel being turned, not just still photos.
- Measured case thickness and lug width.
- Return policy and how long it lasts.
- Whether the strap is rubber, silicone, or leather, and what the clasp is made of.
Bottom line
The IW329124 is a good candidate for a replica because the design is clean and the parts are simple. It is a bad candidate for a lazy one, because the bezel gives it away. Buy from a seller who will show you the bezel moving and name the movement. Skip anyone who sends studio photos and factory nicknames and nothing else.