Which replica IW371779 should you buy first?
Buy the top-tier build first, the one most dealers list under the ZF name. It copies the 40.9mm steel case, the twin subdials at 12 and 6, and the leaf hands closer than any cheaper batch, and its A7750 chronograph matches the architecture of the movement in the genuine. Every other option on this page is a fallback for a lower budget or a different taste.
Street prices for these builds sit between $250 and $450 depending on the dealer and the movement finish. The genuine Portugieser Chronograph sells for several thousand dollars, so the question is never value for money. It is how much of the look survives at arm's length.
Replica IW371779 compared to the genuine watch
The replica gets the silhouette right and the fine details half right. That is the honest summary after handling both.
Case and dial
The genuine case measures about 40.9mm across and 12.3mm thick. Most replica cases land 0.3mm to 0.6mm thicker because the 7750 rotor stack needs room. On the wrist the gap disappears under a cuff, but side by side on a table you can spot it.
Dial printing is the second difference. Genuine leaf hands have a crisp bevel that catches light in a thin line; replica hands are a little flatter and a little wider at the base. The minute track and the "IWC Schaffhausen" text look close in photos and softer under a loupe.
Movement
The 3717-generation Portugieser runs a 7750-derived calibre, so the A7750 inside the replica is a cousin rather than a costume. Beat rate matches at 28,800vph, the pusher feel is close, and the subdial layout is correct. What you lose is finishing on the bridges, the crispness of the rotor engraving, and any factory service support.
Where the replica falls short
- Crystal coating: genuine dual AR makes the dial look wet and nearly invisible under glass; replica coating is weaker and shows more reflection.
- Strap and buckle: the alligator grain and the pin buckle finish are the fastest tell in the hand.
- Water resistance: treat the claimed 30m as decoration. Any real swimming is a risk.
- Caseback engraving: reference numbers and the caseback lettering are shallow compared to the laser etching on the genuine.
Replica IW371779 compared to other replica Portugieser builds
Three builds show up in most catalogs, and they differ in ways you can see without a loupe.
- Top-tier build (first pick, about $350 to $450): correct subdial spacing, applied numerals with proper polish, sapphire with decent AR, A7750 with decorated plates. This is the one to compare against the genuine.
- Mid build (about $250 to $320): same case shape, thinner plating on the hands, dial print that looks flat in daylight, and a movement with less decoration. Fine for daily wear, weak in macro photos.
- Budget build (under $200): printed subdial rings instead of recessed ones, thicker case, stamped buckle. It reads as a Portugieser from two meters and as a replica from one.
- Replica of the newer IW3716 reference: same family, different dial text and a date window. Pick this only if you prefer the newer layout; the older reference is easier to copy well.
Factory names shift between batches, so judge the watch, not the label on the listing. Ask for the case thickness and a macro of the dial before you pay.
How the replica IW371779 compares to other chronograph replicas
The Portugieser is a dress chronograph: slim bezel, two subdials, no tachymeter clutter. That makes it easier to fake than a Speedmaster or a Navitimer, where printed scales and bezel inserts give a sloppy build away.
- Against a Speedmaster replica: the Portugieser is thinner and quieter, but the Moonwatch has far more aftermarket parts and servicing options.
- Against a Navitimer replica: the slide rule bezel on the Breitling is harder to reproduce, so a mid-grade Navitimer shows flaws that the Portugieser hides.
- Against a Daytona replica: the Rolex costs more at every tier and draws more scrutiny. The IWC flies under the radar.
What to check in QC photos before you pay
- Subdial hands resting at zero with the chrono reset.
- Start, stop, and reset the chronograph twice; the minute counter should snap back, not drift.
- Case thickness with calipers in the photo, not a claim in the listing text.
- Macro of the dial print and the applied numerals.
- Reference engraving between the lugs.
- Timegrapher shot showing rate and amplitude.
Frequently asked questions
Is the replica IW371779 worth it compared to a used microbrand chronograph?
Only if you want the Portugieser look. A used microbrand with a Swiss or Japanese movement gives you a real warranty and real water resistance for the same money. The replica buys design, not reliability.
How close is the replica dial color to the genuine?
White and silver-plated dials come close. Blue and salmon dials are harder, and cheaper batches drift toward gray or orange. Ask for a daylight photo with no filter before you commit.
Can a local watchmaker service the replica movement?
Yes, if they work on 7750 clones. Many shops refuse replicas outright, so call first. A full service often costs close to the price of the watch, which is worth knowing before you buy.
Does the replica take genuine straps?
Most top-tier builds use standard 20mm lugs, so aftermarket straps fit. Genuine IWC straps and buckles bolt on without modification, and a good strap hides more flaws than any other upgrade.
Bottom line
Pick the top-tier ZF-line build and skip the rest. It gives you the correct case shape, the right subdial layout, and a movement with the same bones as the genuine. Spend the saved money on a decent strap and a service check.