The replica IW371648 is a copy of the IWC Portugieser Chronograph, a 41 mm stainless steel watch with twin sub-dials at 12 and 6 and a column-wheel chronograph movement. The closest replicas match the 41 mm width and roughly 13 mm thickness, but they almost always run a Valjoux 7750-derived automatic instead of IWC caliber 69355. What separates a good copy from a poor one is dial printing, crystal quality, sub-dial spacing, and pusher feel.
What is the IW371648?
The IW371648 is a Portugieser Chronograph reference from IWC Schaffhausen, part of a line that traces back to the 1998 Portugieser Chronograph. It uses a 41 mm stainless steel case, sapphire crystal front and back, and a 30 m water resistance rating. The dial carries no date window, which matters when you judge a replica.
Inside the genuine watch sits IWC caliber 69355, an automatic column-wheel chronograph with a 46-hour power reserve and a 4 Hz beat rate. Two counters sit at 12 and 6: chronograph minutes on top and running seconds below.
What do the best IW371648 replicas get right?
High-tier copies nail the silhouette first: 41 mm across, about 13 mm thick, 20 mm lugs, and a domed sapphire crystal with a mild blue tint at the edges. Case finishing on the good ones uses brushed flanks with polished bezel and lug tops, close to the original contrast. The dial is where money shows, since applied numerals, thin leaf hands, and crisp printed text are hard to fake cheaply.
Which details give a replica away?
- Sub-dial spacing that sits too far apart or too close, a sign the case was built around a stock 7750 layout.
- A date window at 3 or 4:30, which the genuine reference does not have.
- Printed numerals instead of applied metal ones, or hands that are too thick.
- An exhibition caseback showing a plain rotor with no engraving or striping.
- Pushers that feel gritty or need a hard press to start the chronograph.
What movement sits inside most IW371648 copies?
Most replicas use a Chinese or Swiss-assembled 7750 clone, an automatic chronograph with a cam-actuated start and stop. It works, runs at 28,800 vph, and keeps reasonable time, but the pusher action is heavier and the rotor can be noisy. A few top builds swap in a decorated movement with a column wheel, and those cost far more.
How do you check size, weight, and feel?
Measure the case with calipers at 12 to 6 and at 3 to 9, then measure thickness at the crystal. A faithful replica should read 41 mm and about 13 mm, with a lug-to-lug near 47 mm. On the wrist, a case that feels light or hollow points to a cheaper alloy rather than 316L steel.
Is buying a replica IW371648 legal in the United States?
No. Importing counterfeit trademarked goods is illegal in the US, and U.S. Customs and Border Protection can seize shipments and destroy them. Buyers can also face civil claims from the trademark owner, so treat any purchase as a real legal risk rather than a technicality.
Quick checklist for a replica IW371648
- Confirm 41 mm width, 13 mm thickness, and 20 mm lug width.
- Check that the dial has no date and that both counters line up on the vertical axis.
- Look at the crystal edge for a blue anti-reflective tint, not a flat white glare.
- Start and reset the chronograph; the hands should snap back to zero at once.
- Ask about the movement family before comparing prices, since a 7750 clone and a column-wheel copy are not the same product.
How much does a replica IW371648 usually cost?
Entry copies run roughly 100 to 200 US dollars and show obvious tells in the dial and crystal. Mid-tier builds land near 250 to 400 dollars, and the better decorated movements push past 500. Price alone is not proof of quality, so judge the specific details above.
Does the replica IW371648 chronograph actually work?
Yes, on nearly all copies, because the 7750 clone is a real chronograph movement rather than a decorative plate. The counters at 12 and 6 do function, though sub-dial placement may differ slightly from the original.
Can a replica be serviced by a watchmaker?
Many independent watchmakers will service a 7750-based movement because parts are common and cheap. Some will decline replica work on principle or because gaskets and branded parts are hard to source.