A replica IW371780 is a copy of an IWC Pilot's Watch Chronograph from the 3717 reference family, a 42 mm steel chronograph with a day-date window at 3 o'clock and a black dial. Genuine versions run IWC calibre 79320, a modified Valjoux 7750. Replicas start near $70 for quartz versions and climb past $400 for Asian 7750 builds with a decent case profile. The short answer: factories handle the case and dial fine, the movement is where corners get cut, and the day-date font is where most copies expose themselves.

What the IW371780 Reference Actually Is

Reference numbers in the IWC 3717 family get mixed up constantly, both by sellers and by forum posters. The core watch is a 42 mm stainless steel pilot's chronograph, sapphire crystal on both sides on many variants, screw-down crown, soft iron inner case for magnetic protection, and a matte or sunburst dial depending on the edition. The day-date sits in a single window at 3 o'clock. Power reserve on the genuine calibre 79320 is around 44 hours.

If a listing shows an IW371780 with a dial layout or case size that does not match that description, treat the number as decoration. Ask the seller for the caseback photo before anything else.

Why This Reference Is Hard to Fake Well

Three things trip up replica makers here.

  • The day-date font. Genuine IWC uses a specific weight and spacing. Most replicas use a generic date wheel with letters that look thin or crowded.
  • Dial printing. The IWC wordmark and the Schaffhausen line sit at a precise height. Replicas often print slightly high or low, and the text thickness varies between batches.
  • Case finishing. Brushed tops and polished flanks need a clean transition line. Cheap builds show a mushy edge where the two finishes bleed together.

Movement Options Inside a Replica

Almost every mechanical replica of this watch uses a variant of the Asian 7750. The tiers matter more than any marketing word.

  • Quartz. Sweeping seconds is faked or absent. Chronograph pushers often just start and stop a small stepper motor. Avoid if you care about feel.
  • Standard A7750. Runs, keeps rough time, and the chronograph works. Rotor noise and a stiff winding feel are common.
  • Decorated A7750. Bridges get engraved and plated to mimic the 79320. This is cosmetic, not a mechanical upgrade, but it does raise the price.
  • Claimed Swiss 7750. Mostly fiction at replica price points. Ask for a movement photo with the rotor off, and expect a refusal.

I look for a timegrapher photo before I look at anything else. A seller who cannot produce one is either drop-shipping or hiding a bad rate.

Price Bands and What They Buy

Rough ranges I see in the market:

  • $60 to $120: quartz, wrong case thickness, printed dial that fades under a loupe.
  • $180 to $280: standard A7750, decent case, weak day-date wheel, mediocre lume.
  • $350 to $500: best current builds, decorated movement, better crystal clarity, closer dial text.

Anything quoted above $600 as a replica of this watch is a red flag. You are being charged genuine-adjacent money for a copy.

What I Check in QC Photos

  1. Straight-on dial shot: check the day-date alignment and the spacing of the text lines.
  2. Case side profile: the crown guards should be crisp, not rounded blobs.
  3. Caseback engraving: depth and font weight, plus the reference number itself.
  4. Lume shot: pilot watches live or die on this, and weak lume is the most common complaint.
  5. Bracelet or strap end links: gaps at the lugs are an instant tell.

How to Vet the Seller

Prefer sellers who publish their own photos rather than factory renders, offer a stated return window, and answer movement questions in detail. A seller who only communicates through one app and pushes you to pay via a method with no recourse is not worth the risk. Ask how they handle a watch that arrives dead or with a crooked date wheel. The answer tells you more than the product page.

Legal and Practical Notes

Replica watches are illegal to import or sell in many countries, including the United States, and customs seizures do happen. Warranty and service support do not exist. A 7750-based copy also needs servicing eventually, and many watchmakers will not touch a counterfeit. Budget for that reality before you buy, not after.