Buy the movement and the case geometry, not the listing photos. That single rule decides most IWC 3717 replica purchases. The Portuguese Chronograph is a clean two-subdial dial with almost nowhere to hide: subdial spacing, date font, hand shape, and case thickness all sit in plain view, and the seconds hand at 6 o'clock runs on a transfer gear that cheap builds handle badly. Before you pay anyone in the US, ask for a short video with the chronograph started and stopped, plus a macro shot of the date window and the subdial edges. A seller who cannot produce that is not selling you a watch worth owning. Also know the ground rules: importing a counterfeit watch into the United States is illegal, US Customs can seize the parcel, and no card issuer or marketplace will treat a seized shipment as a refundable order.
What separates a good 3717 replica from a bad one
The movement and the seconds-at-six problem
The genuine IW3717 uses a Valjoux 7750 base, and so do nearly all replicas. The catch is the running seconds. On the real watch the small seconds sits at 6 o'clock, which means the builder needs extra gears to route power there. Low-tier builds use a crude transfer gear that stutters, whines, or dies within months. Better builds use a properly modified 7750 with a smoother gear train. Ask what happens when the chronograph is running, and listen for grinding in the video.
Case and dial geometry
The original measures roughly 40.9 mm across and about 12.3 mm thick, with a 20 mm lug width and applied numerals under a domed sapphire crystal. Most replicas run 1 to 2 mm thicker because the movement spacer is taller, which changes how the watch sits under a cuff. Check the rehaut depth, the date font weight, and the length of the leaf hands. On thin cases, the crystal edge should not sit proud of the bezel.
Parameter bands: reading the tiers
- Entry band: 42 mm or larger case, 14 mm or more thick, mineral or flat sapphire, stamped subdial rings, printed numerals, rough date font. It photographs fine and feels hollow.
- Mid band: 40.9 to 41.2 mm, 13 to 13.8 mm thick, sapphire with single-sided coating, applied numerals, decent hand polish, working chronograph with a noisy seconds gear.
- Top band: 40.9 mm, under 13.2 mm thick, domed sapphire with inside anti-reflective coating, correct date wheel font, crisp subdial spacing at 12 and 6, decorated 7750 with a smooth transfer gear, solid caseback engraving.
Water resistance is the spec sellers inflate most. Treat any claim above 30 m as marketing unless the caseback gasket and crown threads look correct.
What to verify before payment
- Video of the watch running, chronograph engaged, reset pressed twice.
- Weight and thickness measured on a caliper, not quoted from a spec sheet.
- Date flip at midnight, plus a close shot of the numerals.
- Caseback engraving depth and crown logo alignment.
- Shipping terms that state who absorbs a customs seizure, in writing.
Pitfalls to avoid
- Stock photos pulled from the brand website instead of the actual unit.
- "US stock" claims with no tracking origin or return address.
- Sellers who will not show a timestamped photo.
- Payment methods with no dispute path, such as gift cards or peer transfers.
- Forum hype around factory names that vanish within a season.
FAQ
Is a replica 3717 worth it over a homage?
Only if you want the exact dial layout and branding. A homage gives you a real warranty and legal import, at the cost of the logo.
Can a jeweler service one?
A watchmaker who handles 7750 movements can, but many shops refuse replica work. Ask before you buy, not after it stops.
How long do they last?
Top-band builds often run years with a service. Entry builds with the seconds-at-six gear frequently fail inside a year of daily wear.