A fake IW3717 is almost always a Valjoux 7750 or a Chinese copy of one sitting inside a 42 mm steel case. The tells that matter most are the caseback engraving, the dial print, and how the day-date window sits. Get those three right and the watch passes at arm's length, which is why this reference is harder to judge from listing photos than the current Pilot's Chronograph models.

The real IW3717, in plain terms

IWC built the Pilot's Watch Chronograph ref. IW3717 from roughly 2006 until 2012, when the 3777 took over. Steel case, 42 mm across, just under 15 mm thick, black or silver dial, two subdials: running seconds at 6, a 30 minute chronograph counter at 12. Day and date share one window at 3. Inside is the IWC calibre 79320, a heavily reworked ETA 7750 with 25 jewels, 28,800 vph and about 44 hours of run time. Water resistance is rated at 60 m. The chronograph seconds hand carries a small aircraft as its counterweight, and the solid caseback is engraved with a Junkers Ju 52.

Why the replica market for this one is uneven

Discontinued references pull a different kind of buyer. People want the older case size and the older layout, and factories noticed, but they noticed later than they did with the Submariner or the Speedmaster. Most IW3717 replicas on the market are older builds, five to ten years old in plenty of cases, so you are often judging a used fake instead of a fresh one. The newest high tier work went into the 3777 and the Portugieser line. That gap helps you. A sharp IW3717 replica is rarer than a sharp copy of almost any Rolex, and the sloppy ones announce themselves quickly.

The tells that actually matter

  • Caseback engraving. The genuine Ju 52 is stamped deep with crisp edges. Fakes are laser etched, shallow, and washed out under a phone flash.
  • Dial print and applied markers. Look at the edges of the numerals and the lume fill. Real lume sits level and even. Cheap fakes have fuzzy edges and a greenish cast.
  • Subdial layout. Seconds belong at 6, chrono minutes at 12. Budget fakes sometimes ship a 3-6-9 dial that belongs to a different IWC, or a 24 hour hand where the running seconds should be.
  • Day-date window. The window should be square to the dial, with the day disc centered and a font that matches the date wheel. Fakes sit high, sit low, or mix two typefaces.
  • Thickness and pushers. Any 7750 based fake runs thick, and the pushers often stick out further than they should. Ask for a caliper measurement if the seller can manage it.
  • Anti reflective coating. Genuine crystals are coated on both sides, so you see a faint color shift at an angle. Fakes show a blue or purple haze, or nothing at all.
  • Crown and buckle. Check how deep the logo is cut and how sharp the lettering looks. If a manufacturer skimps here, it skimped everywhere.

What sits inside a fake

Most run a 7750 copy with a day-date module bolted on and a rotor engraved to look like IWC work. A counterintuitive point: the genuine 79320 is finished plainly. Circular graining on the plates, IWC markings on the rotor, no blued screws, no fake jewels. A lot of replicas decorate more than the original ever did, so heavy decoration is a warning sign rather than a selling point. The other giveaway is feel. A 7750 based watch rocks on the wrist when the rotor spins, and you hear it. That is normal for the real movement too, so use it as a way to confirm what is inside, not as proof either way.

Price tiers, and what each one buys

  1. Under $130: quartz or a low grade automatic, wrong subdial positions, printed dial, date only or day only, no coating worth mentioning.
  2. $180 to $320: Asian 7750, correct bicompax layout, passable dial print, single sided AR, stiff strap, crown that feels gritty.
  3. $350 to $650: the closest thing to a good IW3717 replica. Case proportions near correct, a caseback that photographs like a stamped one, better dial, coating on both sides, day and date fonts that hold up in close ups. Still not a 79320, and no watchmaker at IWC will touch it.

If you want the real thing instead

Because production stopped in 2012, every genuine 3717 is pre owned. Two things drive price: dial variant and whether the box and papers survived. Budget for a service if there is no recent paperwork, since a 79320 overhaul is not a small number. Check that the day wheel flips cleanly at midnight, and that the chronograph resets to zero without a stutter. Those are the wear points that show up first on this calibre.

Quick checklist before you commit

  • Ask for a macro shot of the caseback and an angled shot of the dial.
  • Confirm subdials at 12 and 6, with seconds at 6.
  • Look at the day-date window straight on, not at an angle.
  • Ask about thickness and strap hardware, since both are cheap to fake badly.
  • Treat water resistance as decoration on any replica. Nobody pressure tests these, and you should not swim with one.