Short answer
"Fake Portofino small seconds 37" is a seller phrase, not an IWC reference. It describes a replica of a 37 mm IWC Portofino with a small seconds subdial at 6 o'clock. IWC does not list a Portofino with all three traits. The genuine 37 mm Portofino Automatic 37 has central seconds. The small seconds hand sits at 6 o'clock on the Portofino Hand-Wound Eight Days, a 45 mm watch. Replica listings blend the two names to widen the search match.
Buyers who search this term see cases between 36 mm and 38 mm, dials with a 6 o'clock subdial, and prices from about $120 to $500. The case, dial layout, and strap change by grade.
Genuine numbers to compare
- Portofino Automatic 37: 37 mm case, about 9.4 mm thick, 18 mm lug width.
- Movement: calibre 35100 on earlier references, calibre 32111 on 2022 and later references. Calibre 32111 runs at 28,800 vph and holds a 120 hour power reserve.
- Crystal: sapphire with anti reflective coating on both faces.
- Strap: alligator leather, 18 mm at the lugs.
- Water resistance: IWC prints the figure in bar on the caseback. Confirm it on the reference sheet for the exact model.
What replica tiers mean
Sellers split stock into grades. A low grade uses a mineral crystal, printed indices, and a 21,600 vph movement. A mid grade adds a sapphire crystal and an Asian clone of the ETA 2824 or 2892. A top grade adds a decorated movement plate, a signed rotor, and closer case finishing. The word "Swiss" in a listing refers to the movement base in some cases and to nothing at all in others. Ask for photos of the caseback and the movement before payment.
Where replicas differ
- Dial print: genuine text is thin and sharp. Replica print is thicker, and the brand name sits off center on many units.
- Subdial: a small seconds hand on a 37 mm case has to fit a subdial at 6 o'clock. On replicas the subdial ring is deeper and the hand length is short.
- Case finish: genuine brushing runs in one direction. Replicas show polish bleeding onto brushed flanks.
- Movement: 37 mm Portofino replicas carry a 2824 style movement at 28,800 vph or a 21,600 vph unit. Neither matches the 120 hour reserve of calibre 32111.
- Weight: a steel replica lands 5 g to 15 g lighter than the genuine piece on the same strap.
- Caseback: genuine engraving is laser cut with clean edges. Replica engraving is shallow and the serial does not match IWC records.
Checks before payment
- Confirm the case diameter with calipers or a ruler against a photo.
- Count the crown positions. A 2824 style movement has three.
- Test the subdial hand at 6 o'clock for wobble.
- Compare crown height and case flank thickness to published photos.
- Ask for the reference number the seller copied.
Legal note
A fake Portofino carries IWC trademarks without a license. Customs agencies in the US and the EU seize these shipments, and IWC will not service or authenticate the watch. Resale value is close to zero.