A replica IW371634 is a third-party copy of the IWC Portugieser Chronograph reference IW371634, made to match the original's 41 mm stainless steel case, two-register dial layout, and leaf-hand styling. It is one of the easier Portugieser references to fake convincingly because the design is clean and the case shape is simple, which is also why so many weak copies exist. The difference between a good replica IW371634 and a bad one comes down to case finishing, dial printing, subdial depth, and the movement inside.

What the IW371634 Actually Is

The reference sits inside the IWC Portugieser Chronograph family. The original uses a 41 mm case at roughly 13 mm thick, a railway-track minute ring, applied Arabic numerals, and two subdials stacked vertically: running seconds at 6 o'clock and elapsed chronograph minutes at 12. Inside the genuine watch is an in-house automatic chronograph calibre with a power reserve of about 46 hours, visible through a sapphire caseback. Water resistance is modest, so the Portugieser is a desk chronograph rather than a sports watch.

That layout matters for replicas. Two subdials at 12 and 6 are harder to fake than a standard three-register chronograph because the spacing, hand length, and dial aperture all have to line up with the case.

Why This Reference Gets Copied So Much

  • The dial is legible and symmetrical, so a copy photographs well.
  • The steel case and simple bezel are cheaper to machine than a complex or precious-metal design.
  • The chronograph function gives the watch a mechanical feel that quartz copies cannot match.
  • The alligator-style strap is easy to source, so the whole package looks complete.

Quality Tiers You Will See

Entry tier

Entry copies usually run a quartz movement with a non-functional or fake chronograph. Hands tick once per second, subdials are often decorative, and the case is polished without brushed transitions.

Mid tier

Mid tier replica IW371634 watches use an Asian automatic chronograph movement derived from a mass-produced chronograph architecture. Pushers work, the seconds hand sweeps, and the date and subdial functions behave normally. Finishing is decent but the rotor and bridges look generic.

High tier

The best copies aim at case geometry, dial texture, and hand finishing. They may use a cloned chronograph movement with decorative plates, a signed rotor, and a sapphire caseback that shows engraving close to the original. This is the tier most buyers mean when they talk about a super clone Portugieser.

Details Worth Checking on a Replica IW371634

  • Subdial spacing: the two registers must sit directly above and below center, not shifted toward one side.
  • Dial printing: text should be sharp under a loupe, with no bleeding or uneven weight.
  • Hands: leaf hands should be polished on the bevels and matte on the flats.
  • Crystal: anti-reflective coating should cut glare from most angles without a blue tint.
  • Case finishing: brushed flanks with polished bevels, and lugs that flow into the case without a hard step.
  • Caseback: engraving depth and font weight are common giveaways.
  • Weight and balance: a hollow-feeling case is a sign of thin steel and a light movement.

Movement Considerations

Movement choice drives everything else. A quartz copy keeps time well but feels wrong the moment you press a pusher. An automatic copy gives you a sweeping seconds hand and a working chronograph, but the finishing under the caseback will not match a genuine in-house calibre. If you care about the view through the back, ask the seller for clear photos of the movement before buying, and ask whether the chronograph resets cleanly to zero.

Wearability and Strap Choice

The Portugieser wears large for a 41 mm watch because the dial is mostly open space and the lugs are thin. On a smaller wrist, the case can overhang. Match the strap width to the original specification and consider a leather strap with hand-stitched edges, since cheap stamped straps are one of the most obvious tells once the watch is on the wrist.

Questions to Ask Before You Buy

  1. Is the chronograph functional, and does it reset to twelve?
  2. What movement is inside, and can you send photos of the caseback and rotor?
  3. Is the crystal sapphire with coating, or mineral glass?
  4. What is the measured case diameter and thickness?
  5. What is the return policy if the watch arrives with a misaligned subdial hand?

A replica IW371634 can look convincing on a table and fall apart under scrutiny. Buy the tier that matches your expectations, check the movement, and treat the dial and case finishing as the two things worth paying more for.