A replica IW371493 is a copy of the IWC Portuguese Chronograph: a 40.9 mm steel chronograph with a silver dial, applied Arabic numerals, leaf shaped hands and subdials at 12 and 6. A strong copy matches the case profile, the dial printing and the subdial spacing, while a weak one shows a thick case, drifting subdials and a gritty chronograph pusher. Judge those four points before you look at price.
What defines the IW371493 reference?
The watch sits in the Portuguese Chronograph family. It uses a stainless steel case of about 40.9 mm across and 12.3 mm thick, a domed sapphire crystal, a closed steel case back, 30 m water resistance and no date window. Inside runs the calibre 79350, a Valjoux 7750 base with a module that shifts running seconds to 6 o'clock.
The look is dressy rather than sporty, so proportion errors read loudly on the wrist. A copy that adds 1.5 mm of thickness or widens the bezel looks wrong next to a photo of the real watch.
Which details separate a good replica from a poor one?
- Subdial spacing: the counters at 12 and 6 should sit on the vertical axis with even gaps to the dial edge and the centre pinion.
- Hands: leaf shape, correct length, no flat stamped tips, and a smooth sweep when the chronograph runs.
- Dial printing: sharp, thin text, even spacing, no bleeding under a loupe.
- Case finishing: brushed flanks, crisp polished chamfers on the lugs, and a bezel that does not look over-polished.
- Pushers: firm start, stop and reset with no mush and no creep on reset.
Why does subdial spacing matter so much?
A standard Valjoux 7750 places running seconds at 9 o'clock, so builders must add a module or transfer gears to move the small seconds to 6. Cheap versions get the geometry wrong first, and the result is counters that sit too close to the centre or too near the edge. Compare any replica iw371493 photo against a straight-on shot of the genuine dial and measure the gap from the centre pinion to each subdial.
What movement will the copy use?
Most mid to upper tier copies run an Asian 7750 with a seconds-at-6 module, which can stutter on the small seconds hand and feels heavier than the real calibre. Cheaper versions use a quartz chrono that keeps time well but gives the wrong hand sweep and a dead-feeling reset. Ask which movement is fitted, then test the chronograph for ten full cycles before you commit.
How does it wear on the wrist?
At 40.9 mm with short lugs, the reference suits wrists from about 6.25 inches upward and slips under a shirt cuff. Check the lug-to-lug span on the copy, since stretched lugs make the watch feel a size larger. A correct strap taper, usually 20 mm at the lugs down to 18 mm at the buckle, keeps the silhouette accurate.
What about the case back and crystal?
The genuine watch uses a solid back with light engraving, so a copy with a deep laser-etched logo or a display back is wrong for this reference. Sapphire should show almost no colour fringe under a lamp. If the crystal hazes at the edges, the box is likely acrylic.
Are there legal or ownership issues?
A replica is not an IWC product and carries no factory warranty or service history, so it cannot be sold or represented as genuine. Trademark and customs rules in the US and EU treat counterfeits differently from homage watches, and resale value is close to zero. Buy with that in mind and never treat a copy as an investment.
Quick checklist before paying
- Measure case diameter and thickness against the published figures.
- Photograph the dial straight on and compare subdial gaps.
- Run the chronograph and watch the small seconds for a full minute.
- Check lug shape, chamfers and strap taper.
- Confirm the seller's return window in writing.