The short answer
A replica IW371740 is a copy of the IWC Portugieser Chronograph, a 41mm steel watch with two stacked subdials and a clean, readable dial. The replicas worth considering get the case size, the dial layout, and the hand shape right. The ones to skip are thick, shiny, and obvious from two feet away. If you remember nothing else, remember this: the dial is where these fakes win or lose.
What the genuine reference looks like
The Portugieser Chronograph has been in IWC's lineup for decades and the reference family has kept the same formula. Stainless steel case around 41mm across. Slim bezel. Leaf shaped hands. Applied numerals rather than printed ones. Two subdials sitting on a vertical line, chronograph minutes at 12 and running seconds at 6. A date window at 3 on most versions. Water resistance is modest, rated for splashes rather than swimming.
That last point trips people up. A real Portugieser is a dress chronograph, not a diver, so a replica claiming 100 meters of water resistance is telling you something about the marketing and nothing about the watch.
Dial details that matter most
Printing is the first thing I look at. On the real thing the minute track is crisp, the text is thin and even, and the subdial rings are concentric and clean. On a cheap copy the printing looks slightly furry under a loupe, the subdial rings are stamped and flat, and the date sits in a window that looks like it was cut with a punch.
Case and finishing
Look at the lugs. Genuine Portugieser lugs curve down toward the wrist, and the polished and brushed surfaces meet on a hard line. Replicas often blur that transition or polish everything. Case thickness is the other tell. A chronograph movement adds height, and a poorly built copy ends up a millimeter or two taller than it should be, which you feel the moment you put it on.
The movement question
Most automatic replicas of this reference run on a Chinese made clone of the Valjoux 7750, usually called an A7750. It works. The chronograph starts, stops, and resets. It is also loud, and the rotor has a wobble you can feel when you move your wrist.
Better builds use a modified 7750 with the subdial positions moved to match the vertical layout, which is not a trivial thing to do. That work is part of why they cost more. Quartz versions exist too. They keep the thickness down and the price low, but the seconds hand ticks instead of sweeping, and that is hard to hide on a watch with a running seconds subdial.
The three tiers you will run into
- Quartz, under about $100. Correct silhouette, wrong heartbeat. Fine if you want the look and nothing else.
- Budget automatic, roughly $150 to $300. A7750 inside. Correct dial layout, thicker case, brighter finishing than the real thing.
- Higher end automatic, $400 and up. Better case shaping, cleaner dial printing, sometimes a copy of the in house movement architecture.
What I check before buying
- Subdial positions. If the chrono minutes and running seconds are not stacked at 12 and 6, the whole thing looks wrong.
- Dial printing sharpness in seller photos. Ask for a close up if you cannot see the minute track.
- Hand shape. Leaf hands should be slim and pointed, not blobby.
- Pusher feel. They should click, not mush.
- Caseback engraving. Deep and even on the good ones.
- Strap quality. Most replicas ship with a stiff leather strap that gives them away faster than the watch does.
Realistic expectations
Nobody is going to hand you a replica and think it came out of a boutique in Schaffhausen. The goal with this reference is different. It is a quiet watch. Almost no one looks twice at it, which is exactly the point. Buy the version with the best dial and the most honest case proportions, put it on a decent strap, and skip the ones with oversized date windows and printed numerals.
Keeping it running
If you go automatic, treat it like a mechanical watch. Do not use the chronograph as a stopwatch for hours on end. Keep it away from magnets, which means away from laptop speakers and tablet cases. Get it serviced or replaced when it starts losing time badly, because repairing an A7750 often costs more than a new one. Store it somewhere dry, and wind it once a month when you are not wearing it.