Buying advice first: before you judge any replica IW371789, write down the original IWC reference specification and check the replica against it line by line. Case diameter, case height, subdial positions, day-date window placement, crown and pusher shape, lug width, dial printing and hand finish are the details that separate a convincing build from a costume piece. Sellers who bury those specs under marketing language are usually hiding case and movement shortcuts too, so treat the spec sheet as your buying contract and reject any listing that will not answer specific questions about it.

Know the Reference You Are Matching

IW371789 sits in the IWC 3717 family, the Pilot's Watch Chronograph line that uses a two-register layout with subdials at 12 and 6 o'clock and a day-date window at 3 o'clock. On the original, the case runs roughly 42 mm across with a tall profile because the chronograph module stacks on top of the base movement. The crystal is sapphire with an inner anti-reflective coating, and the dial uses printed or applied numerals depending on the variant. A replica that shows a three-register layout, a date-only window, or subdial spacing that crowds the hands is not matching this reference at all. Confirm the exact variant and dial color against photos of the true model, since IWC released several dial and strap combinations under similar reference numbers.

What to Look For on the Replica

  • Case proportions: thickness is the loudest giveaway. A movement that is too thick pushes the caseback out and makes the watch sit high above the wrist.
  • Dial details: subdial rings, printed text weight and date font. The date wheel should sit flat and stay centered in the window.
  • Hands: chronograph hands should reach the correct track, and the sweep should be smooth on any mechanical movement.
  • Crystal: look for sapphire with an inner coating rather than mineral glass with a visible purple tint.
  • Crown and pushers: screw-down crown, correct logo stamping, and pushers that engage with a firm click instead of a soft mush.
  • Strap and clasp: leather should be stitched evenly, and the buckle or deployant should match the reference hardware.

Movement Tiers and What They Change

Most replicas in this family fall into three groups. Quartz builds are thin, cheap to run and easy to spot because the chronograph seconds tick instead of sweep. Asian 7750 chronograph movements are the common mid tier: they give a sweeping seconds hand and working subdials, but they add thickness and can be noisy. The top tier uses a Swiss or Swiss-parts 7750 base with a decorated rotor and closer finishing, which usually means better pusher feel and a case profile closer to the original. Ask which base movement is inside, whether the subdials are functional or decorative, and whether the watch has been regulated. A seller who cannot answer those three questions is not worth your money.

Pitfalls to Avoid

  • Photos lifted from genuine listings. Request a live photo with a handwritten note beside the watch.
  • “Swiss made” claims with no movement documentation.
  • Water resistance promises above what the caseback gasket and crown design can support. Treat any replica as splash resistant only.
  • Language like 1:1 or perfect clone. No replica is identical, and the claim signals a sales pitch rather than a spec sheet.
  • No service or parts path. A dead chronograph movement with no replacement source turns into a paperweight.

Legal and Practical Reality

Counterfeit watches are illegal to import and sell in the United States, and shipments can be seized at the border. Replicas also hold no resale value and cannot be serviced by an authorized repair center. If you still choose to buy, keep the purchase small, pay with a method that offers recourse, and inspect the watch against the reference spec the day it arrives.

FAQ

How can I tell a replica IW371789 from the real thing?

Start with thickness, subdial spacing and the date font. Then check the crown action, the crystal coating and the finishing on the caseback engraving. Side-by-side photos of the genuine reference make these differences obvious.

Do the subdials actually work on replicas?

On quartz builds they are usually decorative. On 7750-based builds the running seconds, chronograph minutes and hours should all function. Test them before you accept delivery.

Is a sapphire crystal worth paying more for?

Yes. It resists scratches far better than mineral glass and is one of the few upgrades that affects daily ownership rather than appearance alone.

What should I ask before ordering?

Ask for the movement base, the case diameter and thickness, live photos, and the return policy. Get the answers in writing before you pay.