Short answer

A fake Portugieser Perpetual Calendar copies an IWC watch that lists above $25,000 in steel. Copies sell from $120 to $800. The case, dial, and strap can look close in photos. The calendar is the part that fails. Most copies run a standard date wheel behind a printed year window. A real perpetual calendar handles leap years with no correction until 2100.

What the real watch does

  • Calibre 52615. Automatic, Pellaton winding, 7-day power reserve (168 hours).
  • Case 44.2 mm on the 5034 references.
  • Perpetual calendar with date, month, and a four-digit year window.
  • Leap year correction built into the gear train. No manual change until 2100.
  • Double moon phase: two moons, one for each hemisphere. IWC rates the drift at one day in 577.5 years.

Where copies differ

Leap year

Set a copy to Feb 28 in a leap year and run it forward. Most shift to Mar 1. A perpetual calendar moves to Feb 29. A complete calendar needs five corrections a year: end of Feb, Apr, Jun, Sep, Nov. Many copies need a fix at every month end.

Year window

The four-digit year sits in an aperture and advances with the calendar. On copies the window holds a fixed disc, a printed insert, or a wheel that moves only when a pusher is pressed.

Power reserve and moon phase

The 52615 runs 168 hours. Clone movements run 38 to 42 hours. The moon phase on a copy rides a 29.5-day disc, or sits as a printed dial element that never moves.

Checks before you pay

  1. Ask for a video of the Feb 28 to Mar 1 change in a leap year.
  2. Ask for the four-digit year run through 2024, 2025, and 2026.
  3. Time the power reserve. Wind it full, set it down, check it after 48 hours.
  4. Inspect the caseback. Look at finishing, screws, and rotor engraving.
  5. Measure the case with calipers. 44.2 mm is the number to match.
  6. Weigh the watch. Steel copies land close. Plated brass copies do not.
  7. Compare subdial positions against an IWC press photo.

Price tiers

  • $120 to $250: quartz, printed dial, calendar windows that do not move.
  • $250 to $450: Asian automatic with a date module. Month and date work. Leap year does not.
  • $450 to $800: the top tier sold as 1:1 or super clone. Decorated movement, better case finishing, sapphire glass. Still not perpetual.

Legal position in the US

Counterfeit watches are trademark-infringing goods. US Customs and Border Protection can seize shipments at the border. Selling them carries civil liability. A personal purchase does not make the watch legal to import.

Bottom line

If the calendar has to work like the original, no fake at current prices will do it. If the goal is the look on the wrist plus a working date, the top tier copies come closest. Ask for movement photos and a leap year test before payment.