The short answer

IW328037 is an IWC Pilot's Watch reference from the 3280 family, the Mark XX generation. Replicas of it exist, but the market is thin next to Rolex or Omega, and the tells are almost never in the outline. They live in the case finishing, the dial printing, the movement, and the paperwork. From photos, work through case, dial, crystal, caseback in that order. With the watch in hand, the movement and the feel of the crown settle it fast.

What the IW328037 actually is

You need the real spec before you can judge a copy. The 3280 series is a 40mm stainless steel pilot's watch, about 10.8mm thick, with a soft-iron inner case, sapphire crystal with anti-reflective coating on both sides, 100m water resistance, and a solid caseback. Inside sits IWC's calibre 32111 with a 120 hour power reserve. The dial carries a date at 3 o'clock, a triangle with two dots at 12, and luminous markers. Confirm the exact dial and strap combination for your reference against IWC's own listing before you argue with a seller about anything else.

Case and crown

I look at the brushing first. On a genuine Mark XX the top of the lugs is brushed in one direction, the flanks are polished, and the transition between the two is sharp rather than rolled over. Replicas blur that line, and their brushed grain wanders. Run a thumb along the lug edge. A real one feels like a cut, a fake feels like a sanded curve.

The crown is conical and sits on a short tube, turning with a slight drag. Copies tend to use a generic crown with a softer profile and threads that feel loose in the first half turn. Flip it over and the caseback engraving should be deep and the letterforms even. Fakes use shallow laser etching that catches light differently depending on the angle, and the reference and serial fonts usually run a touch heavier or wider than the real thing.

Dial, hands, and crystal

This generation uses applied numerals and indices, so they sit above the dial with a polished edge. Copies print them or glue flat markers down, and the difference shows in raking light. Look at the triangle at 12: the two dots should be round and evenly spaced. On a fake, one dot is often oval or sits closer to the triangle than the other.

Printing on a genuine dial is clean under a loupe, including the small text below centre. Replica printing shows ink spread, uneven stroke weight, or a hyphen where there should be a dot. The crystal has coating on both faces, which gives a faint blue or purple tint at certain angles. Many replicas coat only the outside, or skip it, which shows up as flat reflections and a duller dial in daylight. Hands should be polished and flat on top, with lume fill that stops at the edge instead of slopping over it.

Movement

If the watch has a display caseback you can end the debate in seconds. The 32111 has a decorated rotor with engraved IWC text, circular graining, and a 120 hour reserve. Wind it, set it, and leave it for two days. A fake with a Miyota or Seagull inside will be dead long before that, and the beat rate, 28,800 vph on the real one, is often wrong on a timegrapher.

Most 3280 series watches have a solid caseback, so you may not get a look. Then judge the power reserve and the winding feel, and ask the seller for a timegrapher photo.

Papers, boxes, and the listing

The paperwork is where lazy fakes fall apart. Reference numbers, card fonts, and booklet paper quality are all easy to fake badly and hard to fake well.

  • Reference number on the card does not match the caseback.
  • Card or booklet printing that is blurry or uses the wrong typeface.
  • A price far below the market for the reference, with a story attached.
  • Photos that avoid the caseback, the crown, or any reflection of the dial.
  • A seller who will not send a timegrapher reading or a video of the watch running.

What I would do before paying

Ask for the serial and reference in writing, ask for a straight-on macro of the dial and a macro of the caseback engraving, and compare both to photos on IWC's site. A five minute phone video of the watch running and the date flipping at midnight is worth more than twenty studio shots. If the seller resists any of that, walk. There are plenty of honest listings for this reference and no reason to gamble on the one that will not answer questions.