The short answer first: "v4" on a fake IW329113 is a factory revision number. It marks the fourth iteration of one replica maker's copy of that IWC reference. It is not an IWC designation, not a quality grade, and not a guarantee. All it tells you is that someone reworked an earlier build, and the only way to know what changed is to inspect the watch in front of you.
The genuine reference, as a baseline
IW329113 sits in IWC's Pilot's Watch Automatic 41 line. The formula is a 41 mm steel case, a matte black dial with applied numerals and the triangle at 12, arrow hands, a soft-iron inner cage for antimagnetic protection, and a screw-down crown. The movement is an in-house automatic from IWC's 32000 series with roughly three days of power reserve.
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That design is hard to fake well because there is nothing to distract the eye. No chronograph subdials, no openworked dial, no gem setting. A short minute hand or a date window cut slightly off center shows at conversation distance. Compare any replica against IWC's own photos of the exact variant before you judge a version number, because the IW3291 block includes more than one dial finish.
What "v4" actually signals
Replica factories ship in batches and revise quietly. Version tags started as seller shorthand and turned into marketing. A v4 label usually means the maker claims to have fixed the flaws buyers complained about in v3: dial print weight, the date font, hand length, caseback engraving depth.
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Two problems follow. First, factories reuse tags across releases, so a v4 from one source is not the same watch as a v4 from another. Second, sellers inherit the tag and pass it on. I have seen the same photos labeled v3 and v4 within a month.
What a fourth revision usually touches
- Dial printing: the weight of "Schaffhausen" and the spacing of the text block under 12.
- Date wheel: font, thickness of the numerals, and how cleanly the window is cut.
- Hands: minute hand reaching the track, arrow tip shape, the finish on the seconds hand pivot.
- Case: lug bevels, crown guard profile, and how the lugs meet the strap.
- Caseback: engraving depth and the crispness of the lettering around the edge.
- Bracelet or strap hardware: screw heads, spring bar fit, buckle stamping.
How I check a claimed v4 before paying
- Ask for a macro shot of the dial at 12 and at 3. Straight on, no filter.
- Ask for a date flip video. A slow or misaligned snap is a tell.
- Ask for a movement photo with the rotor stopped. Rotor finishing and jewel settings separate the tiers.
- Ask for timegrapher numbers: rate, amplitude, beat error. Anything wild means a service bill.
- Ask whether the soft-iron cage is present. Most replicas skip it, and that is a functional difference, not a cosmetic one.
- Confirm the lume color matches between dial and hands under the same light.
Where even a v4 falls short
Antimagnetic shielding is the big one. The genuine watch hides a soft-iron cage between movement and dial; replicas rarely bother, so the magnetic resistance does not carry over. Lume brightness and duration are usually a step behind. Gaskets and crown threads are the parts you cannot see, and they decide whether a splash matters.
Water resistance is not tested on a replica. Treat any rating as decorative and keep the watch away from water.
Buy the watch, not the label
A strong v3 beats a sloppy v4 every time. Version numbers inflate prices, and the premium is often paid for a fix that never happened. Judge photos, ask for video, and compare against the genuine reference at the same angle. If a seller cannot show you the date flip and the movement, the version tag is doing all the work, and you should walk.