Short answer
When a seller advertises a fake IW328070 v4, they mean the fourth revision of a replica IWC pilot's watch. Each version is a factory's attempt to fix what buyers complained about in the previous batch. On this reference, v4 usually brings a slimmer case, cleaner dial print, and a date wheel that sits closer to the real thing. That is not a promise of quality. Two sellers can both list a v4 and one watch will be clearly better than the other.
What the watch is supposed to be
This reference belongs to IWC's Mark family of pilot's watches: a 40mm steel case, a legible dial with large numerals, a date at 3 o'clock, an inner soft-iron cage for magnetic resistance, and sapphire on both sides. The genuine watch runs IWC's caliber 32111, built on a Sellita base, with a five day power reserve. Replicas rarely come close to that reserve, and the gap shows up in daily wear more than any dial flaw. If a listing shows a different size or layout, trust the brand's own spec sheet over the listing text.
What usually changes from v1 to v4
- Case profile. Early batches ran thick through the midcase and sat tall on the wrist. Later versions shaved that down, so measure before you commit.
- Crystal and coating. Anti-reflective treatment is the tell. Weak AR means a grey, milky dial under indoor light.
- Dial print. Numerals get sharper, the minute track gets thinner, and the brand text stops looking bold and smudged.
- Date wheel. Font weight and window position get corrected. A white date disc with fat numerals is the classic giveaway.
- Crown and tube. Threads smooth out, and the crown stops sitting proud of the case.
- Bracelet or strap. End links fit tighter, and the clasp engraving stops looking stamped and shallow.
How I check one in hand
- Measure the thickness with calipers. Anything more than half a millimeter over spec changes how it sits under a cuff.
- Tilt the dial toward a lamp. Good AR makes the crystal disappear at an angle. Poor AR turns the dial into a mirror.
- Set the date to roll over near midnight and watch the jump. A lazy, half-shifted disc is a bad sign.
- Wind the crown slowly. Gritty threads or a wobbling stem mean the movement and case were not mated well.
- Turn it over and check the finishing on the caseback and lugs. Sharp edges on a pilot's watch are unusual on the genuine article.
- Wear it a full day, then check accuracy. A cheap movement can look fine in photos and drift 20 seconds a day on the wrist.
Movements you will see
Most of these replicas ship with a Miyota 9015, a clone of the ETA 2892, or a Sellita SW300 derivative. The Miyota is reliable and cheap to service, but the rotor is louder and the power reserve lands near 40 hours. The 2892 clones run thin and wind smoothly, which suits a slim pilot's case. None of them match the five day reserve of the real caliber, so if a seller claims the replica runs a week on a wind, that claim is worth ignoring.
IWC Mark XX (IW3282) Buying Guide: Skip the v8 Replica
Price bands and red flags
Expect a wide spread. The cheapest examples cut corners on the crystal, the date disc, and the caseback engraving. Mid-range ones fix the dial and case but keep a budget movement. The top of the range adds a better movement, a genuine-grade sapphire, and tighter assembly. Red flags are vague photos, a refusal to show the caseback or the date window, and sellers who cannot say which factory built the watch. A version number without a factory name tells you almost nothing.
FAQ
Does v4 always mean the newest batch?
No. Some factories skip numbers, and some sellers relabel older stock to look current. Ask for a build date and recent photos.
Is it worth paying more for a v4?
Only if the specific fixes matter to you. If the dial print and case thickness were the weak points on v3, then yes. If you never noticed them, save the money.
What should I prioritize if I mainly care how it looks?
Dial, crystal coating, and case proportions, in that order. Those three are what people actually see across a table.