A fake IW371785 is a replica of the IWC Portugieser Chronograph, and it gives itself away through subdial spacing, caseback engraving and the feel of the chronograph pushers. The genuine watch uses an in-house calibre 69355 with a 46-hour power reserve inside a case of roughly 41 mm. Most replicas miss at least one of those measurable points, so a caliper and a loupe settle the question faster than photos do.
What does the reference IW371785 refer to?
IW371785 sits inside the IWC Portugieser Chronograph family, a two-register chronograph with small seconds at 6 o'clock and a 30-minute counter at 12 o'clock. The dial is vertically symmetrical, with the two subdials stacked on the center line. That layout is the single most copied feature in the replica market, and the single most common place for errors.
How do you spot a fake IW371785?
Dial printing and subdial position
Genuine dials carry crisp, raised appliques and text that stays sharp under 10x magnification. On replicas the subdial rings often sit a fraction of a millimeter off center, and the index at 12 is frequently too thick. Look at the gap between the outer minute track and the subdial edge, since replicas tend to crowd it.
Case, pushers and crown
The real case has a polished bezel with a fine brushed flank, and the pushers click with a short, dry snap. Fake IW371785 cases usually show softer bevels and pushers that travel too far or feel mushy. Weight is a useful shortcut too, because a steel replica commonly lands 10 to 25 grams lighter than the original.
Movement and caseback
Genuine examples have an exhibition caseback showing a decorated rotor and blued screws with clean anglage. Replica movements often use a stock chronograph module with printed rather than engraved lettering on the rotor. Reference and serial engravings on the caseback should be deep, evenly spaced and consistent with the paperwork.
What are the replica quality tiers?
- Budget grade: printed dial, quartz or basic automatic, non-working chronograph.
- Mid grade: working chronograph, mineral crystal, correct dimensions.
- First copy grade: sapphire crystal, decorated automatic movement, 1:1 case profile and dial spacing.
First copy is the term used for the top tier, where the maker matches case dimensions, dial layout and crystal material to the original. This tier costs more and is the only one worth comparing side by side with a genuine watch.
What should you check before buying a first copy IW371785?
- Ask for the measured case diameter, not the listed one.
- Confirm the chronograph resets cleanly to zero every time.
- Check that the subdial at 6 actually runs as running seconds.
- Request macro photos of the dial text and the caseback engraving.
- Verify water resistance claims before any contact with water.
Frequently asked questions
Does the chronograph work on a fake IW371785?
On first copy grade, yes. The pushers start, stop and reset the central seconds hand, and the counter at 12 tracks elapsed minutes. Budget replicas often glue the hands in place.
How much does a first copy IW371785 cost?
Top tier replicas generally fall in the low hundreds of dollars, well below the four-figure range of the genuine watch on the secondary market. Price alone does not prove quality, so ask for the movement type and crystal material.
Will a jeweler know it is a replica?
A trained watchmaker usually can, because the movement finish and caseback engraving are hard to fake at scale. Quick tells include rotor decoration, engraving depth and the sound of the winding rotor.