A replica IW371771 is an aftermarket copy of the IWC Portugieser chronograph from the 3717 reference family, and the versions worth buying match four things: a 41 to 42 mm polished steel case, a clean two-register chronograph dial, applied Arabic numerals with leaf hands, and a thin bezel with a visible step down to the mid-case. Price and movement decide the outcome more than any marketing label, because a $250 quartz copy and a $700 modified automatic copy photograph alike and wear nothing alike.
What defines the IW371771 design?
The 3717 family carries IWC's most restrained chronograph layout: two sub-dials, no date window clutter on most variants, a railway minute track and long leaf hands. The dial is the giveaway on any copy, since the Portuguese text, the sub-dial spacing and the printing weight are hard to reproduce cheaply.
Case finishing is the second tell. Genuine examples use a polished case with crisp transitions and a domed sapphire crystal that distorts slightly at the edges.
Which replica tier should you choose?
Three tiers exist and each has a clear signature on the wrist.
- Entry ($120 to $250): quartz or basic automatic, printed rather than applied numerals, flat mineral glass, hollow lugs.
- Mid ($280 to $450): Asian 7750 chronograph, applied markers, sapphire glass, correct sub-dial positions but heavier case profile.
- Top 1:1 ($500 to $800): clone or decorated 7750 with correct hand stack, brushed and polished case alternation, engraved caseback, signed crown.
For a dress chronograph, the mid tier covers 90 percent of what anyone notices. Pay for the top tier only when the caseback and movement finish matter to you.
What should you check in QC photos?
Ask for daylight photos, not studio shots, and inspect these points in order.
- Sub-dial spacing against the genuine reference photo.
- Alignment of the 12 o'clock marker with the crown axis.
- Printing sharpness on the minute track and the brand text.
- Chronograph hand return to zero after a full start, stop and reset cycle.
- Date or sub-dial font weight if the variant has one.
How does the movement affect reliability?
The Asian 7750 is the workhorse of this segment: it delivers a sweeping chronograph second hand and a working reset, but it is thicker than the genuine movement and adds roughly a millimetre to the case. Quartz copies keep correct dimensions and lose the smooth sweep, which is the more visible flaw at arm's length.
What are the common red flags?
Beware listings that show stock manufacturer renders instead of the actual unit, refuse timestamped photos, or promise Swiss movement at a Chinese price. Also treat any claim of a genuine in-house caliber inside a sub-$400 watch as fiction.
Confirm water resistance honestly. Most replicas are splash resistant at best, so keep them away from pools and steam.
How should you care for a replica Portugieser?
Service the automatic movement every three to five years, avoid running the chronograph constantly, and wipe the case with a soft cloth after wear. A domed crystal picks up scratches, so store the watch separately from jewellery.