Buy the movement layout before you buy the watch. On a replica IW3717, the quickest way to lose money is to accept a case that looks correct while the subdials sit in the wrong place or the chronograph works on the wrong principle. Confirm the dial layout against the exact reference you want, confirm which movement family the maker uses to reproduce it, and only then compare finishing, crystal, strap, and packaging. The rest of this guide gives you the checks in order.
What the IW3717 name actually covers
IW3717 sits inside IWC's Portuguese chronograph family, a line built around a clean two register dial, applied numerals, and feuille hands. Because the Portuguese line has run for decades, sellers often label almost any two counter chronograph as an IW3717. Case sizes in this family land between roughly 40 and 42 mm, and dial variants include silver, white, black, and blue with either a date at 3 o'clock or no date at all. Before you compare a replica against the genuine article, pull the official spec sheet for the exact reference. A mismatch in diameter or subdial placement is visible across a room.
How to judge a replica IW3717
1. Movement and subdial placement
The genuine watch uses an in house chronograph architecture with a set distance between the two counters and a set hand height. Many replicas use a modified 7750 family movement, which pushes the subdials closer together or shifts the date window. Ask the seller which movement is inside, whether it is automatic or quartz, and whether the chronograph seconds hand resets cleanly to zero. Request a video of the reset. A lazy reset or a stuttering sweep tells you more than any still photo.
2. Case diameter, thickness, and lug shape
Measure the case with calipers, or ask for a photo of the watch beside a ruler. Profile thickness matters as much as width, because an oversized movement pushes the caseback outward and makes the watch sit high on the wrist. Check lug curvature: the strap should meet the case at an angle that follows the wrist, not a flat horizontal plane.
3. Dial printing and hands
Study the minute track, the wordmark, and the subdial rings under magnification. Crisp, evenly spaced print with consistent stroke width is the target. Check the feuille hands for a proper taper and a polished bevel. Flat painted subdial rings that show no depth under light are a common shortcut.
4. Crystal and coating
Sapphire with a heavy blue or purple glare points to a cheap coating. Better replicas use sapphire with an anti reflective treatment that nearly disappears at an angle. Ask for a photo taken with a phone flash aimed at the crystal.
5. Caseback and engraving
Engraving depth and font weight vary between builds. Compare the reference number, the case material stamp, and the serial against a genuine example from the same production era. On display back versions, look at rotor decoration and bridge finishing.
6. Strap, clasp, and hardware
Stitching density, leather grain, and buckle engraving are the details buyers skip and later regret. Ask whether the strap is real leather or a synthetic. A shallow stamped buckle is a strong signal of a budget tier build.
Parameter bands worth knowing
- Case diameter: 40 to 42 mm across the family. Confirm per reference before you commit.
- Case thickness: roughly 12.5 to 14.5 mm depending on the movement fitted.
- Movement: automatic chronograph preferred. Quartz only if you want a low cost wearer and accept a ticking seconds hand.
- Crystal: sapphire front. Mineral front is a downgrade and scratches with normal wear.
- Water resistance: treat any rating above 30 m on a replica as a claim rather than a fact, and keep it away from water.
- Power reserve: 40 hours and up for a well built automatic. Budget builds often deliver less.
- Lug width: 20 to 22 mm depending on the reference.
Pitfalls to avoid
- Buying from a listing that shows only catalog renders. Renders hide dial printing quality.
- Trusting "Swiss made" printing on the dial. That label on a replica describes nothing about origin.
- Paying a premium for a box and papers set. Packaging is easy to reproduce and adds no accuracy.
- Judging subdial spacing from an angled photo. Ask for a straight on macro shot of the dial.
- Assuming sellers define tiers the same way. Ask which factory and which version number.
- Ignoring after sales support. A movement that needs service with no parts path becomes a paperweight.
FAQ
Is a replica IW3717 worth buying at all?
Only if you accept that it is a lookalike wearer, not an asset, and that resale value is close to zero. Buy it for the appearance on the wrist and nothing else.
How can I spot a fake IW3717 in the wild?
Start with subdial spacing and date position, then check the reset behavior of the chronograph and the quality of the dial print. Those three checks catch most poor builds.
Do I need a video before paying?
Yes. Ask for the chronograph start, stop, and reset, plus a slow pan across the dial and caseback under natural light.
What about water resistance claims?
Assume none. Have a watchmaker pressure test the case if you plan to wear it near water, and treat even a passing result as limited.
How do I compare sizes without calipers?
Ask for a photo of the case next to a ruler or a known object such as a credit card. Card width gives you a fixed reference you can scale from.
Work through the checks in order: movement and subdial geometry first, case and crystal second, dial print and hardware last. A seller who answers all of them with clear photos and video is worth your time. A seller who dodges the movement question is not.