The replica IW371647 worth your money has three things right: a bicompax dial with small seconds at 6 and chrono minutes at 12, a 41mm case roughly 13mm thick, and a chronograph that starts, stops, and snaps back to zero in one clean motion. Get those wrong and nothing else matters. Get them right and you can spend your time on the small stuff: print quality, hand finish, caseback engraving.
Know what the 371647 is before you shop
The reference belongs to the 3716 generation of the Portugieser Chronograph, the 41mm steel line IWC builds around its in-house 69355 calibre. Two counters, no date, leaf-shaped hands, applied numerals, sapphire on both sides. Dial color and finish vary across the reference range, so pull up the exact IW371647 spec sheet on IWC's own site and screenshot it. Replicas from the older 3714 generation sit in the same listings and look close enough to fool a casual search, which is why half the work here is confirming which watch you are actually looking at.
The four tells that matter most
- No date. The 3716 has no date window. A listing showing a date at 3 o'clock is a 3714-style dial, a fantasy build, or a stock photo of the wrong watch.
- Subdial positions. Counters sit at 12 and 6, stacked vertically, and the 12 and 6 numerals are gone. A running seconds subdial at 9 means a stock A7750 sits inside.
- Hands. Thin, sharp at the tips, blued or rhodium finished. Painted hands look flat and slightly thick against a 41mm dial.
- Reset behavior. Run the chrono for ten minutes, stop it, reset it. The hand should jump to zero and stay there. Lag, overshoot, or a creeping hand points to a cheap module.
Which movement you are really getting
At the top of the replica market, a small number of factories build a clone of the 69355 with a column wheel and a layout that matches the original, so pusher feel, subdial placement, and case thickness land close. One tier down sits the modified 7750 family. Reliable, but heavier, louder, and often thicker in the case. The bottom tier is quartz or a low-jewel automatic wearing a decorative rotor. Ask the seller which movement, then ask for a photo of it through the display back. A seller who dodges that question is telling you something.
Case, crystal, and finishing checks
41mm across, 20mm lugs, about 13mm thick. Wind the crown and feel the thread bite. Tilt the watch under a light and look at the crystal edge: domed sapphire with coating on both faces makes the dial nearly disappear at an angle. Brushing should run one direction with no swirl marks, polished flanks should be even, and lug tips should not be sharp enough to scrape skin. Flip it over. Rotor engraving should be crisp and centered rather than shallow and off-axis.
Price sanity and things to skip
Most decent 3716 replicas land between $250 and $500 depending on movement and factory. Under $150 you are buying a quartz watch with a nice story attached. Above $600, a used microbrand starts making more sense. Skip listings with studio photos only, no movement shot, no video, or a seller who will not name the factory.
Ordering checklist
- Confirm the exact reference and dial variant against IWC's spec.
- Get a photo of the movement through the caseback.
- Get a short video showing the chrono reset.
- Confirm 20mm lug width so straps actually fit.
- Confirm return policy and payment method before sending money.
Buy the version you can get serviced, not the one with the prettiest photos. A clone movement that a local watchmaker will touch beats a rare build nobody wants to open.