A replica IW371645 is a reproduction of the IWC Portugieser Chronograph, so the details that matter most are the 41 mm case size, the two-register chronograph dial, and the movement inside. A strong replica IW371645 gets the case profile, sub-dial spacing, and dial printing close to the genuine reference, while a weak one misses the proportions or hides a cheap movement. The checks below separate the two before you spend money.

What the Genuine IW371645 Is

The reference sits inside the IWC Portugieser Chronograph line. Modern versions of that line use a 41 mm stainless steel case, a sapphire crystal, and a display back, with water resistance rated to 30 metres. Inside is an in-house automatic chronograph calibre from the 69355 family with a power reserve in the region of 46 hours. The dial is a bicompax layout: running seconds at 6 o'clock, a 30-minute chronograph counter at 12, and a small date window at 3.

Before ordering any replica, confirm the dial colour, hands, and strap that belong to IW371645 by checking IWC's own product page or a reliable reference database. Reference numbers shift with dial and strap combinations, and sellers often reuse images from a different variant.

What a Good Replica IW371645 Gets Right

  • Case diameter and thickness close to the original, with lugs that curve downward instead of sticking out straight.
  • Sub-dials placed at 12 and 6 with correct spacing from the centre, since wrong spacing is the easiest giveaway.
  • Applied indices and polished hands with clean edges, not flat stamped metal.
  • Crisp dial printing and correct fonts on the numerals and the date wheel.
  • Caseback engraving that matches the reference text, including the model number and movement designation.
  • Pushers and crown sized and shaped like the original, with smooth chronograph start, stop, and reset action.
  • A strap that tapers properly and a buckle that resembles the genuine hardware.

Movement Options Inside a Replica IW371645

Chronograph replicas in this size usually run on one of three movements, and each has trade-offs.

  • Automatic based on the Valjoux 7750 architecture: a familiar feel and easier servicing, though the sub-dial layout often needs modification to sit correctly.
  • Hand-wound Seagull ST19: a smoother sweep and a nicer pusher feel, but you wind it daily and fewer shops will service it.
  • Quartz: the lowest cost and the most accurate, but the seconds hand ticks and the pusher feel differs from mechanical.

Ask the seller which movement is fitted, whether it is automatic or hand-wound, and how the running seconds are driven. A vague answer usually points to an entry-level build.

Dial, Case, and Finishing Checks

  • Crystal: anti-reflective coating should sit on the inside, with no milky haze when viewed at an angle.
  • Dial finish: sunburst or lacquer should shift evenly in light, with no blotches or dust under the glass.
  • Date window: aperture edges should be sharp, and the date font should follow IWC's style.
  • Case finishing: brushed and polished surfaces should meet along crisp lines, not blurred transitions.
  • Weight and feel: a steel case should feel dense in the hand rather than hollow.

Price Tiers and What They Buy

Replica chronographs sit in rough bands. Budget builds often stay under a couple of hundred dollars and show it in the dial printing and the movement. Mid-tier builds cost more and tend to fix the sub-dial spacing, the crystal, and the strap. Top-tier builds push higher still and focus on case machining, correct hands, and a decorated movement. Price alone does not guarantee quality, so compare photos across sellers rather than trusting a tier label.

Checks Before You Buy

  1. Request real photos of the exact watch, including close-ups of the dial, caseback, and clasp.
  2. Confirm the case diameter and thickness in millimetres.
  3. Confirm the movement type and whether it is automatic.
  4. Read the return and warranty terms, and keep the conversation in writing.
  5. Treat any water resistance claim as minimal, and never swim with a replica chronograph.

Looking After a Replica IW371645

Wind or wear the watch on a regular schedule so the lubricants stay spread, keep it away from strong magnetic fields and hot water, and have it serviced every few years if you intend to keep it. Never press the chronograph pushers while the watch is wet. A replacement strap is the cheapest way to sharpen the look, and a well-fitted leather strap in the correct width makes more difference than most dial upgrades.