Short answer
Choose the replica that matches the genuine IW371633 on three points: a 41 mm case with the same slim profile and lug curve, a vertical two-register dial with the 30-minute counter at 12 and small seconds at 6, and a chronograph that starts, stops and snaps back to zero without stutter. Most listings fail on one of those three. Check them in that order before you look at strap options, box or paperwork.
Set the benchmark first
The IW371633 sits inside the Portugieser Chronograph 3716 family, so the same body of specifications applies. Confirm the exact dial color, hand finish and strap fitment for this reference against official IWC documentation, because the family covers several dial and metal combinations that look alike in small photos.
iw371633 Fake Copy - Guide to Identify and Avoid
- Case diameter near 41 mm, height around 13 mm, polished bezel with brushed flanks.
- In-house calibre 69355, a column wheel chronograph with roughly 46 hours of power reserve.
- Vertical bicompax layout: 30-minute totalizer up top, small seconds below.
- Water resistance rated to 3 bar, which means splash resistance and nothing more.
- Sapphire crystal on the front, exhibition caseback on most variants.
What to look for
Case and proportions
Measure the thickness, not just the diameter. A correct 41 mm footprint with a slab-sided 15 mm case defeats the whole look of a dress chronograph. The lugs should curve down toward the wrist and end in a sharp, even bevel. Check that the crown and pushers sit flush, line up on the same axis, and do not wobble in the tube.
Dial and printing
Look at a macro shot, never a thumbnail. Indexes should be applied and seated flat. The minute track should be crisp and evenly spaced. Text weight matters: letters that look painted on, blurry or crowded are the fastest tell. Subdial hands should be the right length and reach the printed scale. If your reference shows a date window, the aperture should be square to the dial and the magnifier free of haze.
Buyer's Guide to IW371633 Fake Watches
Chronograph and movement
Ask which caliber drives it and whether the registers actually work. A decorated Asian chronograph automatic is the normal choice at this level. Push the top pusher: you want a short, defined click rather than a mushy press. Run the chronograph for a minute, stop it, reset it. The hand should land dead on zero every time. A wobbling reset hand means the movement was assembled without care.
Crystal, caseback and strap
Sapphire front glass with a clear anti-reflective coating is the floor for a serious purchase. On the back, engraving should be cut, not printed, and the reference text should match what you ordered. Strap leather should feel supple with tight, even stitching, and the buckle should not flex under thumb pressure.
Parameter bands
Judging by tier works better than chasing a number, because replica pricing moves and sellers rename the same watch constantly. Compare features instead.
- Entry tier: mineral glass, quartz or a basic automatic, subdials that sit too close to the center, a case often 1 to 2 mm too thick. Fine as a novelty, poor as a daily wearer.
- Mid tier: sapphire front crystal, working automatic chronograph, correct 41 mm footprint, clean dial printing, decent strap. This is the sweet spot for most buyers.
- Top tier: a clone based or well-finished column wheel movement, correct hand shapes and lengths, applied indexes, cut caseback engraving, hardware that matches the original in finish. Worth the jump only when the seller provides real macro photos of the actual unit.
Pitfalls to avoid
- Listings that reuse another seller's photos. Request a timestamped shot of the exact watch.
- Wrong subdial spacing. The two registers should sit on one clean vertical line with room between them.
- Overthick cases, which read wrong on the wrist at a glance.
- Gritty pushers or a chronograph hand that resets past zero.
- A date magnifier that clouds the numerals or sits off-center.
- Water resistance claims that ignore the 3 bar rating of the genuine watch. Treat any replica as splash resistant.
- Sellers who market 1:1 as a grade while hiding movement, dial and case detail.
FAQ
How close is a good replica of IW371633 to the original?
On the wrist, a top tier example gets the silhouette, dial layout and pusher feel close. Under a loupe, differences show up in movement finishing, engraving depth and the edges of the dial printing.
Which movement should I expect?
A working automatic chronograph with two live registers. Confirm whether it is a decorated Asian chronograph caliber or a clone, and skip quartz for this reference, since the subdials behave differently.
Does case thickness matter more than dial accuracy?
For daily wear, yes. Thickness and lug curve decide how the watch sits on your wrist. Dial accuracy decides what other people notice.
What should I check when it arrives?
Pusher feel, reset to zero, subdial alignment, crown threading, crystal clarity, strap stitching, and whether the caseback engraving matches the reference you ordered.