Short answer
A replica Portugieser Hand-Wound 37 copies the IWC Portugieser: a 37 mm case, a thin profile, and small seconds at 6 o'clock. Genuine steel versions list above $5,000 in US dollars, and gold versions cost more. Replicas sell from about $150 to $500. The replica is not made by IWC, carries no IWC warranty, and cannot be serviced by an IWC boutique or service center. The movement inside is a Seagull, Hangzhou, or Miyota hand-wound caliber, not an IWC in-house caliber.
What the genuine watch is
The Portugieser Hand-Wound 37 is the smallest case in the Portugieser line. The case measures 37 mm across. The dial carries applied numerals, leaf hands, a railway minute track, and a small seconds subdial at 6 o'clock. The caseback has a sapphire display window. The movement is hand wound, so the owner turns the crown each day or every few days. Power reserve is rated in hours or days depending on the caliber. Caliber numbers change between versions and case metals, so confirm the exact caliber and reserve on the IWC spec sheet for the reference you compare against.
What changes on a replica
- Case: 37 mm copies exist, but some sellers ship 40 mm or 42 mm and label it 37 mm. Ask for caliper photos.
- Thickness: replicas run 1 to 2 mm thicker than the genuine watch because of the movement holder and caseback depth.
- Dial: printed logo instead of applied metal. The subdial can sit 0.5 to 1 mm off center.
- Crystal: mineral glass on cheap units, sapphire on mid and top tiers.
- Movement: no IWC caliber. Expect a Chinese hand-wound unit or a Miyota 6T33.
- Strap: alligator-grain leather, not alligator skin.
Movement tiers
Tier 1 uses a generic Chinese hand-wound caliber with a 36 to 40 hour reserve and no decoration. Tier 2 uses a Seagull hand-wound caliber, a known platform with parts sold in the West. Tier 3 uses the Miyota 6T33 from Citizen, a Japanese hand-wound caliber with a small seconds hand at 6 o'clock. The Miyota holds time with less daily drift and costs more. Ask the seller for a photo of the movement ring and the caliber stamp before you pay.
Checks before payment
- Ask for a photo of the watch next to a ruler or caliper, dial side and case side.
- Ask for the caliber name and the beat rate in bph. 21,600 bph is common. 28,800 bph is better.
- Ask for a timegrapher photo that shows rate and amplitude.
- Test the crown in person or on video: a hand-wound watch needs smooth winding and a hard stop at full wind.
- Get return terms in writing, with the return window and the shipping address.
Legal and practical notes
In the US, counterfeit watches are illegal to import and to sell. 18 U.S.C. § 2320 covers trafficking in counterfeit goods, and U.S. Customs and Border Protection can seize shipments. A watch that copies a trademarked logo is a counterfeit, not a homage. Buyers get no factory service, no parts network, and little resale value. Water resistance numbers on replicas come from the seller, not from a pressure test, so keep the watch away from pools and showers.