A replica IW329170 is a third-party copy of IWC's 42 mm Aquatimer Automatic dive watch. Good examples match the steel case, the internal rotating dive bezel, the applied markers and the bracelet proportions. Weak examples miss the bezel feel, the dial printing and the crown guards, and those are the details that give a copy away on the wrist.

What is the replica IW329170?

The IW329170 sits in IWC's Aquatimer Automatic family: a 42 mm steel case, an inner dive bezel driven by a crown at 2 o'clock, a screw-down crown, and a choice of steel bracelet or rubber strap. A replica reproduces that silhouette at a fraction of the original price. The outside of the watch carries the look. The movement inside decides how it behaves day to day.

Because this is a dive watch, buyers judge a copy on three things first: bezel action, lume and water resistance. Case finishing comes next.

What should you inspect before buying?

Case and finishing

Run a finger along the case sides. Sharp edges mean the case was polished by machine and never finished by hand. On a good copy the brushed surfaces are even, the polished chamfers break cleanly, and the lugs curve without flat spots.

Check the gap where the lugs meet the bracelet. A wide, uneven gap is a common fault on cheap builds.

Bezel action

The inner bezel should move in firm, even clicks with no wobble and no slack at the start of the turn. Ask the seller for a short video of the bezel being turned. This one check rules out most low-grade examples before you spend anything.

Dial, hands and lume

Look at the marker edges under light. Printed markers look flat and slightly fuzzy; applied markers sit above the dial with a visible metal frame. The date window should sit square in the cutout with even margins.

Charge the lume with a phone light, then check it in a dark room. Weak lume fades in under an hour. A decent copy holds a glow for several hours.

Movement

Most replicas of this reference use one of three movements: a Seiko NH35 (21,600 vph, about 41 hours of reserve), a clone of the ETA 2824 (28,800 vph, about 38 hours), or an Asian 2824 variant with a decorated rotor. Ask which one is fitted and whether the watch was regulated after assembly.

A decorated movement plate is cosmetic. Timing performance comes from regulation and build quality, not engraving.

Water resistance

A replica marked 300 m on the caseback has almost never been pressure tested. Treat it as splash resistant until a watchmaker tests the gaskets and seals. Swimming with an untested copy risks a flooded movement and a repair bill larger than the watch.

How do replica grades compare?

• Budget tier. Stamped or thin case, printed markers, rough bezel motion, basic quartz or low-grade automatic. Works as a visual stand-in at a distance.
• Mid tier. Solid steel case, applied markers, NH35 or clone 2824, decent bracelet with a milled clasp. This is where most buyers land.
• Top tier. Hand-finished case, correct bezel detents, sapphire crystal with inner coating, regulated movement, solid end links that fit the lugs without gaps.

The jump from mid to top tier costs money but fixes the small tells: bracelet rattle, bezel slack and dial print quality.

What does a replica IW329170 cost?

Asking prices in the replica market fall into rough bands rather than fixed prices. Use them as a filter, not a rule.

• Low grade: under $150. Expect printed dial details and a light case.
• Mid grade: $250 to $450. Solid steel, applied markers, NH35 or clone movement, sapphire on better examples.
• High grade: $500 to $900. Finished case, regulated movement, tight bracelet fit, better lume.

A price far below the band for the spec sheet is a warning. Sellers who list sapphire, applied markers and a regulated Swiss-clone movement at $120 are describing a watch that does not exist.

How do you spot a poor example?

• Photos that are small, blurry or taken only from the front.
• No video of the bezel turning or the seconds hand sweeping.
• Marker edges that look printed under close light.
• Bracelet that rattles when shaken, or end links that do not sit flush.
• Seller who cannot name the movement.
• Vague answers about returns, or no returns at all.

Ask for a close-up of the dial at 10x, a clip of the bracelet flexing, and a photo of the caseback with the serial area visible. A serious seller sends all three without argument.

How should you care for a replica dive watch?

• Rinse the case with fresh water after contact with salt water or sand, then dry it with a soft cloth.
• Have the gaskets checked once a year if you wear it near water.
• Keep the crown screwed down when you are not setting the time or date.
• Store it away from magnets, speakers and phone chargers.
• Service the movement every four to six years, or sooner if it starts losing more than 20 seconds a day.

Frequently asked questions

Does a replica IW329170 keep accurate time?

A regulated NH35 or clone 2824 usually runs within 10 to 20 seconds a day. That is inside the range most people accept from a mechanical watch at this price. Ask for a timing reading before you buy.

Can you swim with it?

Only after a watchmaker pressure tests the seals. The number on the caseback is a claim, not a measurement. Until it has been tested, keep it away from water.

Is a replica worth it?

It is worth it if you want the Aquatimer look for daily wear and accept that it is a copy with no service history and no warranty from the original brand. It is not worth it if you plan to dive with it or resell it later.

Where do the biggest tells show up?

Bezel feel, bracelet fit at the lugs, and lume brightness. Those three details separate a good copy from a weak one faster than any logo or engraving.