Start with the short answer

A replica Portofino Automatic 37 copies IWC's 37 mm three-hand dress watch. Good versions match the case diameter, dial layout, and strap fit. Weak versions miss on crown size, date font, lug curve, and hand finish. Run the checks below before you pay, and compare every measurement against the published specs of the exact reference you want.

Know the reference before you compare

  • Case diameter is 37 mm, with a slim profile that sits close to the wrist.
  • Dial layout is three hands plus a date window at 3 o'clock. No subdial, no chronograph.
  • Markers are applied batons. Hands are leaf shaped.
  • Strap is leather with a pin buckle. Some versions ship on a Milanese mesh bracelet.
  • Caseback is a solid screw-down or snap-on cover with engraving, not a display back.

Inspect the case

  1. Measure the diameter with calipers at the 9 to 3 line and confirm it reads 37 mm, not 38 or 39.
  2. Measure the thickness and compare it with the official figure for that reference.
  3. Check the lug-to-lug span against the spec sheet, since this decides how the watch sits on a smaller wrist.
  4. Run a fingernail across the bezel edge and confirm it is polished without a sharp lip.
  5. Look at the crown size and the engraving depth on its face. Undersized crowns and shallow logos are the most common tell.

Inspect the dial and hands

  1. Hold the watch under a lamp at an angle and check that every baton marker sits straight and level.
  2. Read the brand text and the small print under 12 with a loupe. Letters should be crisp, evenly spaced, and free of ink bleed.
  3. Check the date window for a centered number, a clean cut edge, and a font that matches the original.
  4. Turn the watch dial down and confirm the hands show no rough edges or uneven brushing.
  5. Look for dust, glue residue, or fibers under the crystal.

Test the movement

  1. Wind it slowly by hand and feel for grit or a rough ratchet.
  2. Set the time forward and back and confirm the hands move without lag or slip.
  3. Set the date well away from the 9 p.m. to 3 a.m. window, when the change mechanism is engaged.
  4. Set it down for 24 hours and compare the drift against your starting reading.

Check the strap and buckle

  1. Flex the leather and confirm it is lined, not a single thin layer.
  2. Check stitching for even spacing and no loose thread ends.
  3. Read the buckle engraving under a loupe and compare the font weight with the dial text.

What no replica gets right

  • Movement finishing and long-term serviceability.
  • Factory warranty or service from the original brand.
  • Resale value, which is effectively zero.
  • Metal hallmarks if the original reference uses precious metal.

Legal and practical limits

Counterfeit watches infringe trademarks and are illegal to sell in the United States. Customs can seize shipments, and a replica cannot be serviced by the brand or resold as genuine. Buy with that in mind, keep the price in line with what a copy is worth, and never represent one as an original.

Red flags to walk away from

  • Photos that hide the crown, the date window, or the caseback.
  • No measurement given for diameter or thickness.
  • A price far below the rest of the market for the same version.
  • A seller who claims the watch is genuine or "same factory as the original."