What a replica IW371654 is
IW371654 belongs to the IWC Portugieser Chronograph family, a 41mm steel chronograph that sells new for around $8,000 and up. A replica is a copy of it, built to look like the real watch at a fraction of that price. That is the whole promise, and it is also where the trouble starts. The same reference number gets printed on a $60 quartz watch and on a $400 build with a working chronograph and a properly shaped 41mm case. The listing title will not tell you which one you are looking at. The movement spec will.
What the real watch does, and why it matters for a copy
The genuine Portugieser Chronograph (ref. IW3716 series) runs on IWC calibre 69355, an in-house automatic with a column-wheel chronograph and roughly 46 hours of power reserve. Earlier versions of the line used a modified Valjoux 7750, which is cam-actuated instead. The case is 41mm, the crystal is sapphire, and water resistance is 30 meters, which covers rain and hand washing and not much else.
Two visual details decide how convincing a copy looks on the wrist:
- Bicompax layout. Chronograph minutes sit at 12 o'clock, running seconds at 6. There is nothing at 3 and nothing at 9.
- Leaf hands and applied numerals. Thin, tapered, polished, with a slim sweep hand.
Get those two right and the watch reads as a Portugieser across a table. Get the subdial spacing wrong and it reads as a copy from any distance.
Replica tiers you will run into
Budget tier, roughly $60 to $120
Usually quartz or a low-grade automatic. The case is often 42mm to 44mm because the builder reused an off-the-shelf shell. Subdials are frequently fake, either printed on the dial or driven by a date wheel pretending to be a counter. The pushers feel like buttons on a calculator.
Mid tier, roughly $150 to $250
This is where A7750-based builds live. Real working chronograph, 41mm case more often than not, decent crystal. The weak points are thickness, since the 7750 stack is deep and the watch sits tall, plus the date window and rotor noise.
High tier, roughly $300 and up
Closer case dimensions, cleaner dial printing, sapphire with proper anti-reflective coating, and sometimes a clone of the 69355 or a slimmed automatic. The subdials line up with the genuine bicompax arrangement and the hands are shaped right instead of merely silver. None of them is the real thing. Even the best carry tells under a loupe, and none come with IWC's warranty or service network.
How to check a listing before you buy
- Ask for the movement by name. "Automatic" is not an answer.
- Ask for measured case diameter and thickness in millimeters, with calipers in the photo. Spec sheets get copied from the genuine watch.
- Look at where the subdials sit. On a correct build they are pulled toward the center, not spread to the edges.
- Check the printing. Portugieser dials use fine, thin type. Thick or smeared lettering is the fastest tell.
- Check the caseback engraving and the reference stamp. Sloppy or inconsistent numbers matter.
- Ask about the crystal. Flat mineral instead of sapphire shows up in reflections right away.
Wear, sizing, and care
At 41mm the Portugieser Chronograph is a comfortable size for most wrists, though the tall case on cheaper builds can make it feel bigger than the number suggests. The correct strap width is 20mm. Keep it away from pools and showers, since 30 meters of water resistance in a replica is a claim, not a guarantee. If it carries a mechanical chronograph, do not leave the chronograph running all day, and do not reset it while it is engaged. Service intervals on a clone movement are shorter than you would like, and parts availability is the real limitation.
The short version
A replica IW371654 can look convincing on a wrist if you buy in the higher tiers and verify the subdial layout, case dimensions, and movement before paying. It will not fool a watchmaker or a loupe. Buy the build, not the reference number in the listing title.