Quick Answer

Judge a fake Portofino Small Seconds on seven checks: case diameter and thickness, the 6 o'clock subdial position, hand finish, dial printing, crown action, caseback engraving, and beat rate on a timegrapher. Measure before you look. Photos lie, calipers do not.

Prerequisites

  • Digital calipers with 0.01 mm resolution
  • 10x jeweler's loupe
  • Timegrapher, or a phone app that reads beat error and amplitude
  • Factory photos of the exact reference you are matching
  • Soft cloth and a spring bar tool

Inspection Steps

  1. Confirm the exact reference you are comparing against. The Portofino family spans about 34 mm to 45 mm across automatic, hand-wound, and chronograph versions, and small seconds models differ in subdial size and date placement. Pin down one reference before you judge anything else.
  2. Measure the case across 12 to 6 and across 9 to 3 with the calipers, then measure thickness at the center of the caseback. Published factory specs run to a tenth of a millimeter. Most fakes sit 0.3 to 0.8 mm off in one direction, and the thick ones wear top heavy on the wrist.
  3. Measure the small seconds subdial. Check its diameter, its center point against the crystal, and the length of the subdial hand. On a genuine small seconds, the hand tip reaches the outer edge of the subdial track. On many fakes it stops short of it.
  4. Study the dial printing through the loupe. Examine the brand name, the automatic or hand-wound line, and the Swiss Made text at 6 o'clock. Replicas show feathered edges, uneven stroke weight between letters, and a font that runs heavier than the original.
  5. Check the applied indices. Each one should sit flat on the dial with squared sides and a clean polished bevel. Look for glue squeeze-out at the base and any gap between the marker foot and the dial surface.
  6. Inspect the hands. Portofino leaf and baton hands carry polish on the top facet and a satin or brushed finish on the sides. A fake often shows full polish on every face, or a burr along one edge of the hand.
  7. Work the crown. Unscrew it and count the threads, then wind the movement and feel for grit. Crown engraving should be crisp and centered. Winding should stay smooth with a firm stop at the end of the power reserve.
  8. Read the caseback under the loupe. Reference number, movement number, and water resistance markings should be cut clean and sharp. Shallow, doubled, or paint-filled engraving is a tell that the case came from a low-grade source.
  9. Test the crystal with a light at an angle. A flat sapphire with inner anti-reflective coating all but disappears under a point source. Mineral glass throws a gray cast and picks up faint scratches that show under 10x magnification.
  10. Set the time and watch the subdial hand for stutter or backlash. A hand that jumps when you push the crown back in points to a loose cannon pinion or a poorly seated hand.
  11. Run the watch on a timegrapher at full wind. Record rate, amplitude, and beat error in the dial-up position, then repeat dial-down. A freshly wound automatic that reads under 250 degrees of amplitude has a tired mainspring or a dirty movement.
  12. Lay the watch beside your factory photo under the same light and shoot both from the same angle and distance. Differences your eye skipped in person show up in a side-by-side frame, especially in case profile and lug curve.

Red Flags

  • Subdial hand that does not reach the subdial track
  • Printed text that feathers or bleeds at the edges
  • Crown that grinds or wobbles when you set the time
  • Caseback engraving filled with paint instead of cut into metal
  • Amplitude under 250 degrees on a freshly wound movement
  • Case thickness that sits more than 1 mm off the published spec

Bottom Line

Case measurements and subdial geometry separate a good fake Portofino Small Seconds from a bad one faster than any dial detail. Measure the case, measure the subdial, then verify the movement on a timegrapher. If all three hold up, the cosmetic checks will confirm what the calipers already told you.