The top pick, if you want the look and the mechanics of an IWC Portugieser chronograph, is an authentic example whose reference number can be confirmed against IWC records, bought new from an authorized dealer or used from a specialist that offers a return window. The criteria that separate a good buy from a bad one are narrow and testable: reference verifiability, movement provenance, factory serviceability, and resale or legal risk. Anything sold as a fake IW371770 fails at least two of those four tests, and usually three.
Start with the reference number itself
IWC reference numbers in the Portugieser family follow the IW37xxx pattern, and the digits after IW matter. A listing that quotes a number you cannot find in IWC's published collection information, or that a boutique cannot confirm, is already a problem. Counterfeit sellers often quote numbers that read plausibly but do not match the case, dial, or movement in the photos. Before you compare anything else, ask for the full reference and serial, then verify both through IWC or an authorized dealer.
That single step filters out most of the noise. If the number cannot be confirmed, the rest of the listing is decoration.
Option 1: authentic, new, from an authorized dealer
- Pros: confirmed reference and serial, factory warranty, service intervention if something goes wrong, documented provenance.
- Cons: highest price, waiting lists on popular configurations, fewer discontinued dial variants to choose from.
Best for a first serious purchase, or a gift where paperwork and warranty transfer matter to the recipient.
Option 2: authentic pre-owned with box and papers
- Pros: lower entry price, access to older dial and case variants, value holds when the set stays complete.
- Cons: condition varies, service history is often undocumented, and you must budget for an independent authentication step before paying.
Best for a buyer who already knows the model line. Ask for movement photos, a warranty card with a serial that matches the case, and a written return window.
Option 3: the replica and the fake
This is the category the keyword usually leads to, so it deserves a direct answer rather than a sales pitch.
- Pros: low purchase price, and the silhouette of a Portugieser chronograph from across a room.
- Cons: no factory service, unknown movement and unknown water resistance, no resale market, engraving and dial printing that do not survive close inspection, and genuine legal exposure. Counterfeit goods infringe trademarks and are subject to seizure at import in the United States.
Not recommended for anyone who plans to wear the watch near water, keep it for years, or sell it later. If the appeal is the design rather than the badge, a legitimate microbrand chronograph at the same price will outlast it and can actually be repaired.
Details that give a copy away
Focus on the parts a counterfeiter cannot reproduce cheaply: the crispness and depth of caseback engraving, the finish on the crown and pushers, subdial hand alignment at reset, the texture and stitching of the strap, and whether the reference and serial on the case match the paperwork. Blurry listing photos are not modesty, they are a tactic. Ask for macro shots in daylight before you commit.
Before you pay: a short checklist
- Confirm the reference number and serial with IWC or an authorized dealer.
- Match the serial on the case to the warranty card and any service records.
- Request daylight macro photos of the dial, caseback, crown, and clasp.
- Pay with a method that offers buyer protection, and get the return window in writing.
- Budget for a service on any pre-owned mechanical watch, and walk away from anything priced at a fraction of market.